Hi
I have instaled official TTS mechanism for the Slovene language on Android 12, because Slovene is not on the list of languages in Google's speech services. MIT App Inventor apps work on Android 8 but not on Android 12. I tested the same apps on a similar Thunkable platform and everything is ok there.
Apparently App Inventor is having trouble accessing the other TTS engines (speech API) in Android 12.
Thank you