Just upgraded from flip 5 to flip 6. I noticed this phone when connected to my Android auto via wire does not put out guidance voice during navigation. Other apps like audible still plays audio but only guidance is silent. If I clear data on maps and Android auto and test the guidance audio, from the car's android auto interface. The test sound plays for 3 seconds or so and I can hear it get quiet as if someone is turning the sound down. It becomes completely silent and voice does not come back.
I've tried clear data, restart, and also toggling permissions on both apps. Not sure what is causing this. Let me know if anyone experienced this. My wife's phone works as expected and her and I have the exact same settings.
Contacted Samsung and they advised the lack of audio is a known issue. They are working on a patch. Advised that it should work as long as your equalizer settings on the Galaxy Z Fold 6 are set to "Balanced". Confirmed that fixed my problem including google assistant
