I had same issue and contacted developer. He did not help in anyway. I actually feel robbed. When I decide to support a developer is an appreciation of his hard work. But when I ran into bad luck and my phone is no longer accessible, he did not extend the support. I cannot help but to say that I am dissappnited.
I downloaded it and tested it this afternoon with AA 7.6.121504 on the S21 Ultra one UI 4.1 non-root and nothing happened and nothing changed. The dev posted that all that needs to be done is delete the apps and redownload through his app and the problems will be resolved.
Im running 1.4.4 screen2auto when mirroring most every streaming ap the video is blank. TCM channel works and my phone always shows. The closed caption and sound works on every stream ap.
Yeah I see that after last update from Google 7.5.621364 Formata auto is not working. Try uninstall android auto and find APK version 7.4 and should be ok again. I did that and formata auto is working again
Relax. It's just a few bucks.