The same thing happen to us. A simple fix was to add the NSHealthShareUsageDescription and NSHealthUpdateUsageDescription for our other target's/extension's info.plist.
andybodymatter
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Not sure if this would help but here is one of their WWDC video on AVAudioEngine. It links to a sample project that might lead you to do what you want to do. But if anything, you can try using AudioKit since it has better documentation and a community.