All apps need to use AUVoiceIO in order to use Mic Modes, but what is AUVoiceIO? I searched the Apple Developer Document, but there was no description of AUVoiceIO anywhere. Why didn't the Apple Developer Document include a description of AUVoiceIO? Isn't it possible to use AUVoiceIO with this?
What's AUVoiceIO?
AUVoiceIO stands for Audio Unit Voice IO.
You should find info here:
https://developer.apple.com/videos/play/wwdc2021/10047/?time=1384
You could also file a bug report against documentation.