Demystify code signing and its importance in app development. Get help troubleshooting code signing issues and ensure your app is properly signed for distribution.

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Developer ID Installer certificate location
I want to export Mac OS application out side App Store and I need to have Developer Id installer certificate to do the same. When I go to certificate section in developer portal - I only see option of Mac App Distribution Mac Installer Distribution Developer ID Application Does anyone know where I can check the Developer ID installer part. Developer ID application doesn't work for signing the app manually.
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Sep ’25
What is the difference between applying "hardened runtime" to an executable and adding the `-o library` flag to codesign?
Hey, Just recently I realized something I have been overlooking in my build pipelines. I thought that by adding the the "hardened runtime", I disable 3rd-party library injection (I do not have the disable-library-validation entitlement added). However, I was using some checks on my code and I noticed that the "library validation" code signature check fails on my applications (e.g. adding the .libraryValidation requirement via the LightweightCodeRequirements framework) - with codesign -dvvvv /path/to/app I can check it doesn't have the CS_REQUIRE_LV flag: [...] CodeDirectory v=20500 size=937 flags=0x10000(runtime) hashes=18+7 location=embedded [...] then I used in Xcode the "Other Code Signing Flags" setting and added the -o library option, which added the flag: [...] CodeDirectory v=20500 size=937 flags=0x12000(library-validation,runtime) hashes=18+7 location=embedded [...] Is this flag something I should be explicitly setting? Because I was under the impression enabling hardened runtime would be enough. Popular Developer ID distributed applications (e.g. Google Chrome, Parallels Desktop, Slack) all have this flag set.
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Sep ’25
Transfer App ID from one dev account to another for existing Enterprise app
We have an enterprise app that was developed when the IT group in the U.S. had their own enterprise developer account and HQ in Europe had their own. App's were kept separate for whatever reason. Over the past few years all new app ids etc have been created in HQ account but the local US account still contains this one legacy app ID. The app it's associated with is distributed globally and on tens of thousands of devices. Is there a way to transfer the app id etc to from the local US dev account to the HQ owned global account. I know this is possible with App Store distributed app's but this is an enterprise app that is distributed to our corp owned devices through AirWatch.
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Oct ’25
App Packaging: Error: HTTP status code: 403
Coming from Windows, I'm finding Mac app packaging farcically complicated, to the level of a Python sketch. I mastered Windows packaging, via Inno, in an hour or so, but it has taken me, on and off, the best part of a week to get to the point I am at with the Mac OS, and I'm nowhere near finished (rather, it hasn't finished with me). Every time I surmount one hurdle, another pops up, seemingly just for the jollies. I'm currently stuck at: 'Error: HTTP status code: 403. A required agreement is missing or has expired. This request requires an in-effect agreement that has not been signed or has expired. Ensure your team has signed the necessary legal agreements and that they are not expired.' My account lists no agreements in this category. I understand the need for security, but not the labyrinthine nature of the process. An inner-party member in the former Soviet Union overheard a drunken Stalin say, “I trust no one; not even myself". Apple trusts no one, but has true contempt for developers. Is there a simple way to work through the packaging process? Let me rephrase that: please God, let there be a simpler way of working through the process! Regards, in extremis, Richard
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Some of the apps I have developed are being flagged as malware
I have a free developer account, and I have been creating applications. When I tried to open one of them, it said that this app has been flagged as malware. It is not malware, so I don't know why it has been flagged as this. Not just this app, but suddenly a whole bunch of my apps have been flagged as malware as well! The app I have been developing is basically a windows Taskbar for my macbook air, and it has been working well until the latest update i made where it hides in full screen, suddenly it started taking up significant energy, so i reverted to an older version while i was fixing it. Then, when i try to open it another time, it starts to open, and it says "Malware Blocked and Moved to Bin" “Taskbar.app” was not opened because it contains malware. This action did not harm your Mac”. All versions of the taskbar now contain this message. I try opening some of my other apps, a shared storage client and a shared storage server (where i was testing with app groups), and they couldn't open either, the same malware message appeared. ProPermission couldn't open either (changes permissions on files for me so i don't have to use the terminal or finder). I can run these apps through the Xcode environment (attached process), but when I archieve it into an app bundle, the malware flag appears. Please note that I am certain that these apps do not contain malware, apparently XProtect has incorrectly flagged my apps as malware. Because I do not have the paid developer account, I cannot notarize my apps. I am using MacOS Tahoe 26.1 with Xcode 26.0, and I have tested it with a iMac Intel 2017 with MacOS Ventura.
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