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I have the exact opposite issue. Calls to AVSpeechSynthesizer fail on an iPhone 12 Pro Max running 16.2, but work as expected on the simulator. I've stripped down projects to the bare minimum for both Storyboard-based and SwiftUI, with the same result, so the scope doesn't seem to be the issue, but I've moved the declaration of the AVSpeechSynthesizer to the enclosing view, just to be sure.

Ross isn't suggesting a "walled garden" approach. He's talking about not relying on beta software for production uses. By all means, load real projects into real applications on a beta system to test it. If and when that fails, report it to Apple, and then go back to your system that's running non-beta software and get your work done.But by no means should you be installing beta software on a production machine, with no other way to get work done, and then complain to Apple about how their product isn't living up to your expectations. If you don't have a secondary system to get production work done, you shouldn't be installing beta software, unless you're ready to deal with situations exactly like this.Tim