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Reply to Dual Monitor Studio Display XDR fails on MacBook Pro M4 Pro
First off, to clarify the purpose of this forum and my role at Apple, this forum is specifically to support engineers building products for our platform, not consumer-level support. I'm responding here because I hope the information will be helpful to you and to other engineers working on our hardware. However, I can't comment on if or when this will be fixed, nor am I the right person to try and pass feedback through. Secondly, on the feedback side, I'd appreciate you filling a bug on this and then posting the bug number back here so I can ensure it gets to the correct team. That's the best way to get this feedback to the relevant engineering team. In any case, I can't provide you with a direct solution, but I can confirm that this is basically what's going on: From what I am reading, it appears to be that the M4 Pro has 3 display lanes, and when I plug the first Studio Display XDR, it is using 2 lanes. More specifically, the kernel logic that assigns display pipes to monitors is not particularly so
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Simulator fails to boot
Im working on my laptop with Mac OS 15.7.5 and Im using Xcode 26.0.1 and Im trying to simulate the code I've written. It only allows me to simulate on iPhone 16e but it never finishes loading, I also tried using my personal iPhone as a simulator but that doesn't work either. Could it possibly be my storage on why the simulators don't work?
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CoreML MLE5ProgramLibrary AOT recompilation hangs/crashes on iOS 26.4 — C++ exception in espresso IR compiler bypasses Swift error handling
Area: CoreML / Machine Learning Describe the issue: On iOS 26.4, calling MLModel(contentsOf:configuration:) to load an .mlpackage model hangs indefinitely and eventually kills the app via watchdog. The same model loads and runs inference successfully in under 1 second on iOS 26.3.1. The hang occurs inside eort_eo_compiler_compile_from_ir_program (espresso) during on-device AOT recompilation triggered by MLE5ProgramLibraryOnDeviceAOTCompilationImpl createProgramLibraryHandleWithRespecialization:error:. A C++ exception (__cxa_throw) is thrown inside libBNNS.dylib during the exception unwind, which then hangs inside __cxxabiv1::dyn_cast_slow and __class_type_info::search_below_dst. Swift's try/catch does not catch this — the exception originates in C++ and the process hangs rather than terminating cleanly. Setting config.computeUnits = .cpuOnly does not resolve the issue. MLE5ProgramLibrary initialises as shared infrastructure regardless of compute units. Steps to reproduce: Create an app with an .mlpackage Core
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Reply to Crashes occur on iOS 26.4
Part 1: Thank you for your reply. I have attached the log file. I apologize for the inconvenience, but please take a look. So, starting with the log, the first thing that jumps out at me is that it's ascribing the crash to this stack in thread 0: Thread 0 Crashed:: Dispatch queue: com.apple.main-thread: 0 libsystem_kernel.dylib 0x24a42ccd4 mach_msg2_trap + 8 1 libsystem_kernel.dylib 0x24a43030c mach_msg2_internal + 76 2 libsystem_kernel.dylib 0x24a43022c mach_msg2 + 4 [inlined] 3 libsystem_kernel.dylib 0x24a43022c mach_msg_overwrite + 424 4 libsystem_kernel.dylib 0x24a430078 mach_msg + 24 5 CoreFoundation 0x19b9dfea4 __CFRunLoopServiceMachPort + 160 6 CoreFoundation 0x19b9a9f94 __CFRunLoopRun + 1188 7 CoreFoundation 0x19b9a91d0 _CFRunLoopRunSpecificWithOptions + 532 8 GraphicsServices 0x240eb7498 GSEventRunModal + 120 9 UIKitCore 0x1a166d2cc -[UIApplication _run] + 796 10 UIKitCore 0x1a15d8158 UIApplicationMain + 332 11 UnityFramework 0x11cbfbb08 12 sekai 0x1020bbbb8 13 dyld 0x1985bdc1c start + 6928 That's ba
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Different app behavior when running on device from Xcode
I have an app I am working on that makes a REST call, updates the UI with the info, and sends a notification. When I run Build and Run my app from Xcode using my iPhone as the destination, it works exactly as I want it to - my REST calls and notifications continue to work when the app is in the background. However, when I run my app that has been installed on my iPhone from the Xcode build/run directly (without Xcode in the picture), it does NOT behave correctly and only works when my app is in the foreground. What am I missing?
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Reply to Does the OS has dedicated volume levels for each AVAudioSessionCategory.
Also, on the specific question here: Could you please explain about this inconsistency w.r.t. Volume level. There are actually at least two different factors at work here: I don't know the full details of the entire system, but the system does maintain separate volume states for at least CallKit and other audio, so that phone calls start at a consistent volume regardless of other activity. Different audio session configurations have different maximum volumes and, in particular, Playback is louder than PlayAndRecord. In addition, the CallKit AudioSession has a noticeably higher max than a standard PlayAndRecord. Either/both of those factors mean that it's normal for the playback volume to change when the audio category changes. This doesn't matter for most apps, as they simply pick the category that best fits their overall requirements and don't change it. __ Kevin Elliott DTS Engineer, CoreOS/Hardware
Topic: Media Technologies SubTopic: Audio Tags:
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Apple Rejection
Thank you for submitting an update to the app, Macy's: Online Shopping & Save, for review. We noticed some issues that require your attention. Please see below for additional information. If you have any questions, we are here to help. Reply to this message in App Store Connect and let us know. Review Environment Submission ID: d429df7a-35c1-4b8f-a85f-c0cce2dcd376 Review date: March 26, 2026 Review Device: iPhone 17 Pro Max Version reviewed: 2603.4.0 Guideline 5.1.2(iii) - Legal - Privacy - Data Use and Sharing Issue Description The app includes fingerprinting functionality that is designed to identify the user or device. Specifically, the app aggregates user and device data to track the user, either directly or indirectly using probabilistic methods. This functionality is found in services or code included in the app, such as AppsFlyer. Apps that fingerprint users or devices are not appropriate. Per section 3.3.9 of the Apple Developer Program License Agreement, neither you nor the app
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Automating closing of iCloud Tab?
I would like to script my Mac to close a specific iCloud Tab of my choice that is open on my iPhone. This is for Accessibility reasons. Ideally, I’d prefer to do this without using GUI scripting. AppleScript methods only seem to see tabs in Windows Extensions also do not seem to have visibility of the other types of tabs I've tried many options so far, but all seem to not work and are also far too brittle even if they did. I have a feeling I'm missing something! 1. Toolbar Dropdown In Desktop Safari you can enable a toolbar button “iCloud Tabs” which when clicked shows a list of the tabs currently open on your other devices. If you hover one, an X appears which can be clicked to close the tab. When you next use Safari on the remote device that tab will be closed. If it’s already open and awake then the removal happens around one second later. It’s quick. (But I did try GUI scripting and I can get to the row in the outline in the popup, but I can’t get the cross to appear to click it) 2. Start Page th
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AccessorySetupKit: Can I use bluetoothNameSubstring be used without bluetoothCompanyIdentifier?
I'm integrating AccessorySetupKit for BLE earbuds discovery and running into an issue with ASDiscoveryDescriptor configuration. Our earbuds don't have a fixed Bluetooth SIG company identifier. So I'm trying to use bluetoothNameSubstring + bluetoothServiceUUID instead. However, this combination never discovers any devices. The picker appears but stays empty. As soon as I add a bluetoothCompanyIdentifier, the device is found instantly. I reproduced this with my Bose QC35 II as well, so it's not specific to our hardware. My configuration: bluetoothServiceUUID: set to our custom UUID bluetoothNameSubstring: set to a substring matching the advertised device name NSAccessorySetupBluetoothServices + NSAccessorySetupBluetoothNames both set in Info.plist supportedOptions: .bluetoothPairingLE iOS 26.3.1, iPhone 11 The documentation doesn't mention that bluetoothCompanyIdentifier is required. Is bluetoothCompanyIdentifier actually required for BLE discovery? If so, is there a recommended approach for devices th
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Will Apple Developer support phone number based Apple accounts?
When signing in on the Apple Developer website with the phone number-based account I created when I was setting up my Mac, this error message is shown: Your Apple ID is not eligible to use this application at this time. I've seen other people with this problem and I hope that we will be able to log in using phone number accounts soon. For now, creating a new email-based account seems to be the only solution, but I don't want to do that 😂
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Reply to test NEAppProxyProvider without MDM?
[quote='881984022, Davidbaraff2, /thread/820572?answerId=881984022#881984022, /profile/Davidbaraff2'] There is a DHCP server on the local LAN to assign addresses to devices. [/quote] Do you actually need that? Or is this something you can’t control? [quote='881984022, Davidbaraff2, /thread/820572?answerId=881984022#881984022, /profile/Davidbaraff2'] if my iPad is trying to talk to anything on say 192.168 [/quote] Does that include multiple subnets? That is, does the DHCP server hand out a 192.168/16 address? Or does it hand out a 192.168.x/24 address? And in that case, are there resources on other 192.168.y/24 networks that you need to talk to? [quote='881984022, Davidbaraff2, /thread/820572?answerId=881984022#881984022, /profile/Davidbaraff2'] can you suggest any other way to accomplish this? [/quote] Depending on your answers to the above, you could potentially do this with an off-the-shelf VPN. Specifically, this would work if you can configure the VPN to: Always run over WWAN. Claim the default r
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My app fails to launch since I have changed of iPhone (from iPhone13 pro to iPhone 17 pro)
Since I have changed of iPhone (yesterday) to run my draft application, I systematically, and instantaneously get a message The application failed to launch., i.e. the application successfully built and was downloaded to the new iPhone (Iphone 17 pro - iOS 26.4). I have checked that this new iPhone is well registered on my list of authorized devices. Could you help me to fix this issue ? Here is the verbose attached to the failure: The application failed to launch. Domain: com.apple.dt.CoreDeviceError Code: 10002 User Info: { BundleIdentifier = com.laurent-guise.ble-laser; DVTErrorCreationDateKey = 2026-03-30 07:59:46 +0000; IDERunOperationFailingWorker = IDELaunchCoreDeviceWorker; } The request to open com.laurent-guise.ble-laser failed. Domain: FBSOpenApplicationServiceErrorDomain Code: 1 Failure Reason: The request was denied by service delegate (SBMainWorkspace). User Info: { BSErrorCodeDescription = RequestDenied; FBSOpenApplicationRequestID = 0x3868; } The op
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WiFi WPA3 Cypher Problem
I've submitted a couple of pieces of feedback regarding broken WPA3 support on iOS 26 for the iPhone 17 Pro Max, and I've seen various access point vendors report that the GCMP256 cypher is not working. If you use WPA2, there is no issue. The problem I'm running into comes down to WPA3 being mandatory on 6 GHz. Some vendors have reported that disabling GCMP256 on Cisco Meraki hardware solves the problem. No other major vendor exposes this level of options. Does anyone know if it's possible to get more verbose diagnostic information out of the WiFi stack? I need actual information about why the negotiation fails, the technician-level stuff.
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Reply to Dual Monitor Studio Display XDR fails on MacBook Pro M4 Pro
First off, to clarify the purpose of this forum and my role at Apple, this forum is specifically to support engineers building products for our platform, not consumer-level support. I'm responding here because I hope the information will be helpful to you and to other engineers working on our hardware. However, I can't comment on if or when this will be fixed, nor am I the right person to try and pass feedback through. Secondly, on the feedback side, I'd appreciate you filling a bug on this and then posting the bug number back here so I can ensure it gets to the correct team. That's the best way to get this feedback to the relevant engineering team. In any case, I can't provide you with a direct solution, but I can confirm that this is basically what's going on: From what I am reading, it appears to be that the M4 Pro has 3 display lanes, and when I plug the first Studio Display XDR, it is using 2 lanes. More specifically, the kernel logic that assigns display pipes to monitors is not particularly so
Replies
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Views
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1d
Simulator fails to boot
Im working on my laptop with Mac OS 15.7.5 and Im using Xcode 26.0.1 and Im trying to simulate the code I've written. It only allows me to simulate on iPhone 16e but it never finishes loading, I also tried using my personal iPhone as a simulator but that doesn't work either. Could it possibly be my storage on why the simulators don't work?
Replies
0
Boosts
0
Views
29
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CoreML MLE5ProgramLibrary AOT recompilation hangs/crashes on iOS 26.4 — C++ exception in espresso IR compiler bypasses Swift error handling
Area: CoreML / Machine Learning Describe the issue: On iOS 26.4, calling MLModel(contentsOf:configuration:) to load an .mlpackage model hangs indefinitely and eventually kills the app via watchdog. The same model loads and runs inference successfully in under 1 second on iOS 26.3.1. The hang occurs inside eort_eo_compiler_compile_from_ir_program (espresso) during on-device AOT recompilation triggered by MLE5ProgramLibraryOnDeviceAOTCompilationImpl createProgramLibraryHandleWithRespecialization:error:. A C++ exception (__cxa_throw) is thrown inside libBNNS.dylib during the exception unwind, which then hangs inside __cxxabiv1::dyn_cast_slow and __class_type_info::search_below_dst. Swift's try/catch does not catch this — the exception originates in C++ and the process hangs rather than terminating cleanly. Setting config.computeUnits = .cpuOnly does not resolve the issue. MLE5ProgramLibrary initialises as shared infrastructure regardless of compute units. Steps to reproduce: Create an app with an .mlpackage Core
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171
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Reply to Crashes occur on iOS 26.4
Part 1: Thank you for your reply. I have attached the log file. I apologize for the inconvenience, but please take a look. So, starting with the log, the first thing that jumps out at me is that it's ascribing the crash to this stack in thread 0: Thread 0 Crashed:: Dispatch queue: com.apple.main-thread: 0 libsystem_kernel.dylib 0x24a42ccd4 mach_msg2_trap + 8 1 libsystem_kernel.dylib 0x24a43030c mach_msg2_internal + 76 2 libsystem_kernel.dylib 0x24a43022c mach_msg2 + 4 [inlined] 3 libsystem_kernel.dylib 0x24a43022c mach_msg_overwrite + 424 4 libsystem_kernel.dylib 0x24a430078 mach_msg + 24 5 CoreFoundation 0x19b9dfea4 __CFRunLoopServiceMachPort + 160 6 CoreFoundation 0x19b9a9f94 __CFRunLoopRun + 1188 7 CoreFoundation 0x19b9a91d0 _CFRunLoopRunSpecificWithOptions + 532 8 GraphicsServices 0x240eb7498 GSEventRunModal + 120 9 UIKitCore 0x1a166d2cc -[UIApplication _run] + 796 10 UIKitCore 0x1a15d8158 UIApplicationMain + 332 11 UnityFramework 0x11cbfbb08 12 sekai 0x1020bbbb8 13 dyld 0x1985bdc1c start + 6928 That's ba
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Different app behavior when running on device from Xcode
I have an app I am working on that makes a REST call, updates the UI with the info, and sends a notification. When I run Build and Run my app from Xcode using my iPhone as the destination, it works exactly as I want it to - my REST calls and notifications continue to work when the app is in the background. However, when I run my app that has been installed on my iPhone from the Xcode build/run directly (without Xcode in the picture), it does NOT behave correctly and only works when my app is in the foreground. What am I missing?
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4
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102
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Reply to iCloud Sync not working with iPhone, works fine for Mac.
I just updated my iPhone to 26.5 beta. The syncing is now working on the iPhone. I have Mac, AppleTV and iPhone all running at the same time, and any change to SwiftData on any of the 3 devices immediately updates on the other 2.
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Reply to My app fails to launch since I have changed of iPhone (from iPhone13 pro to iPhone 17 pro)
Curiously, I just switched off the developer mode on the concerned iPhone, and switched on after restart, and magically things now work. Mysterious, isn't it ...
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Reply to Does the OS has dedicated volume levels for each AVAudioSessionCategory.
Also, on the specific question here: Could you please explain about this inconsistency w.r.t. Volume level. There are actually at least two different factors at work here: I don't know the full details of the entire system, but the system does maintain separate volume states for at least CallKit and other audio, so that phone calls start at a consistent volume regardless of other activity. Different audio session configurations have different maximum volumes and, in particular, Playback is louder than PlayAndRecord. In addition, the CallKit AudioSession has a noticeably higher max than a standard PlayAndRecord. Either/both of those factors mean that it's normal for the playback volume to change when the audio category changes. This doesn't matter for most apps, as they simply pick the category that best fits their overall requirements and don't change it. __ Kevin Elliott DTS Engineer, CoreOS/Hardware
Topic: Media Technologies SubTopic: Audio Tags:
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Apple Rejection
Thank you for submitting an update to the app, Macy's: Online Shopping & Save, for review. We noticed some issues that require your attention. Please see below for additional information. If you have any questions, we are here to help. Reply to this message in App Store Connect and let us know. Review Environment Submission ID: d429df7a-35c1-4b8f-a85f-c0cce2dcd376 Review date: March 26, 2026 Review Device: iPhone 17 Pro Max Version reviewed: 2603.4.0 Guideline 5.1.2(iii) - Legal - Privacy - Data Use and Sharing Issue Description The app includes fingerprinting functionality that is designed to identify the user or device. Specifically, the app aggregates user and device data to track the user, either directly or indirectly using probabilistic methods. This functionality is found in services or code included in the app, such as AppsFlyer. Apps that fingerprint users or devices are not appropriate. Per section 3.3.9 of the Apple Developer Program License Agreement, neither you nor the app
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1
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0
Views
59
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Automating closing of iCloud Tab?
I would like to script my Mac to close a specific iCloud Tab of my choice that is open on my iPhone. This is for Accessibility reasons. Ideally, I’d prefer to do this without using GUI scripting. AppleScript methods only seem to see tabs in Windows Extensions also do not seem to have visibility of the other types of tabs I've tried many options so far, but all seem to not work and are also far too brittle even if they did. I have a feeling I'm missing something! 1. Toolbar Dropdown In Desktop Safari you can enable a toolbar button “iCloud Tabs” which when clicked shows a list of the tabs currently open on your other devices. If you hover one, an X appears which can be clicked to close the tab. When you next use Safari on the remote device that tab will be closed. If it’s already open and awake then the removal happens around one second later. It’s quick. (But I did try GUI scripting and I can get to the row in the outline in the popup, but I can’t get the cross to appear to click it) 2. Start Page th
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0
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0
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165
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AccessorySetupKit: Can I use bluetoothNameSubstring be used without bluetoothCompanyIdentifier?
I'm integrating AccessorySetupKit for BLE earbuds discovery and running into an issue with ASDiscoveryDescriptor configuration. Our earbuds don't have a fixed Bluetooth SIG company identifier. So I'm trying to use bluetoothNameSubstring + bluetoothServiceUUID instead. However, this combination never discovers any devices. The picker appears but stays empty. As soon as I add a bluetoothCompanyIdentifier, the device is found instantly. I reproduced this with my Bose QC35 II as well, so it's not specific to our hardware. My configuration: bluetoothServiceUUID: set to our custom UUID bluetoothNameSubstring: set to a substring matching the advertised device name NSAccessorySetupBluetoothServices + NSAccessorySetupBluetoothNames both set in Info.plist supportedOptions: .bluetoothPairingLE iOS 26.3.1, iPhone 11 The documentation doesn't mention that bluetoothCompanyIdentifier is required. Is bluetoothCompanyIdentifier actually required for BLE discovery? If so, is there a recommended approach for devices th
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1
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0
Views
24
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Will Apple Developer support phone number based Apple accounts?
When signing in on the Apple Developer website with the phone number-based account I created when I was setting up my Mac, this error message is shown: Your Apple ID is not eligible to use this application at this time. I've seen other people with this problem and I hope that we will be able to log in using phone number accounts soon. For now, creating a new email-based account seems to be the only solution, but I don't want to do that 😂
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37
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Reply to test NEAppProxyProvider without MDM?
[quote='881984022, Davidbaraff2, /thread/820572?answerId=881984022#881984022, /profile/Davidbaraff2'] There is a DHCP server on the local LAN to assign addresses to devices. [/quote] Do you actually need that? Or is this something you can’t control? [quote='881984022, Davidbaraff2, /thread/820572?answerId=881984022#881984022, /profile/Davidbaraff2'] if my iPad is trying to talk to anything on say 192.168 [/quote] Does that include multiple subnets? That is, does the DHCP server hand out a 192.168/16 address? Or does it hand out a 192.168.x/24 address? And in that case, are there resources on other 192.168.y/24 networks that you need to talk to? [quote='881984022, Davidbaraff2, /thread/820572?answerId=881984022#881984022, /profile/Davidbaraff2'] can you suggest any other way to accomplish this? [/quote] Depending on your answers to the above, you could potentially do this with an off-the-shelf VPN. Specifically, this would work if you can configure the VPN to: Always run over WWAN. Claim the default r
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2d
My app fails to launch since I have changed of iPhone (from iPhone13 pro to iPhone 17 pro)
Since I have changed of iPhone (yesterday) to run my draft application, I systematically, and instantaneously get a message The application failed to launch., i.e. the application successfully built and was downloaded to the new iPhone (Iphone 17 pro - iOS 26.4). I have checked that this new iPhone is well registered on my list of authorized devices. Could you help me to fix this issue ? Here is the verbose attached to the failure: The application failed to launch. Domain: com.apple.dt.CoreDeviceError Code: 10002 User Info: { BundleIdentifier = com.laurent-guise.ble-laser; DVTErrorCreationDateKey = 2026-03-30 07:59:46 +0000; IDERunOperationFailingWorker = IDELaunchCoreDeviceWorker; } The request to open com.laurent-guise.ble-laser failed. Domain: FBSOpenApplicationServiceErrorDomain Code: 1 Failure Reason: The request was denied by service delegate (SBMainWorkspace). User Info: { BSErrorCodeDescription = RequestDenied; FBSOpenApplicationRequestID = 0x3868; } The op
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1
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41
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WiFi WPA3 Cypher Problem
I've submitted a couple of pieces of feedback regarding broken WPA3 support on iOS 26 for the iPhone 17 Pro Max, and I've seen various access point vendors report that the GCMP256 cypher is not working. If you use WPA2, there is no issue. The problem I'm running into comes down to WPA3 being mandatory on 6 GHz. Some vendors have reported that disabling GCMP256 on Cisco Meraki hardware solves the problem. No other major vendor exposes this level of options. Does anyone know if it's possible to get more verbose diagnostic information out of the WiFi stack? I need actual information about why the negotiation fails, the technician-level stuff.
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2
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55
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