After pairing with bluetooth with my car infotainment system. I am able to make calls but not able to play audio files, Youtube or from Google music on the audio system. i have
* Nokia 6 with 7.1
* Herman music system.
There is a bug in the latest OS update on nokia 6 with music over bluetooth.
Calls work, but music doesn't.
There's no official acknowledgement of this bug nor any promise of when it will be fixed.