If I’m in a TeamViewer session (iPhone XS iOS 15.3.1) while in my car, the app activates my car’s Bluetooth audio and it thinks I’m in a phone call. (It turns off my car’s music and blocks any real calls.)
I have to force quit the TeamViewer app to regain control of my car’s audio.
I don’t need/want to play the remote computer’s audio through my phone, so there is no reason to do this.