AVSpeechSynthesizer Enhanced voices produce silent audio in sandboxed Mac Catalyst app

Question

alexshecha OP

Created Sep ’26

Replies 3

Boosts 0

Participants 2

I have reproduced an issue with AVSpeechSynthesizer on macOS 26.6.2 (25G83) using a minimal Mac Catalyst application.

Environment

macOS 26.6.2 (25G83) Apple Silicon Xcode 26.x Mac Catalyst AVSpeechSynthesizer Enhanced voice: com.apple.voice.enhanced.en-GB.Daniel

The problem is specifically related to App Sandbox.

Reproduction

I created a completely new minimal Mac Catalyst application.

With App Sandbox disabled:

let synthesizer = AVSpeechSynthesizer()

let utterance = AVSpeechUtterance(string: "Hello, this is a test.") utterance.voice = AVSpeechSynthesisVoice(identifier: "com.apple.voice.enhanced.en-GB.Daniel")

synthesizer.speak(utterance)

The Enhanced voice works normally.

With App Sandbox enabled, with no other sandbox capabilities enabled, the same code no longer produces audible speech.

Answered by DTS Engineer in 907192022

Sorry for the delay response; things got a bit bananas around here.

I have opened bug report: FB24653879

Thanks.

You mentioned that you’ve seen it on 26.6.2. Do you have same problem on 26.7? And 27.0?

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

Answer 1

DTS Engineer OP

Apple

Sep ’26

Hmmm, that sounds like a bug to me. Please file it as such, then post your bug number, just for the record.

Make sure to include your test project and a sysdiagnose log taken shortly after seeing the issue.

Coming back to your real app, are you sandboxing it because you’re targeting the Mac App Store? Or simply because it’s the right thing to do?

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

Answer 2

alexshecha OP

Sep ’26

I have opened bug report: FB24653879

Answer 3

DTS Engineer OP

Apple

1w

Accepted Answer

Sorry for the delay response; things got a bit bananas around here.

I have opened bug report: FB24653879

Thanks.

You mentioned that you’ve seen it on 26.6.2. Do you have same problem on 26.7? And 27.0?

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"