My Chevy Silverado is not connecting to my phone, charging, or Android Auto. It's not the vehicle's ports because I can connect and charge my Galaxy Watch. I think it's the UI 7 beta. If you all can look into it for the second-wave release.
IT could be the cable (assuming you are using a cable based on the ports comment), or could just need a phone restart, if you have not tried that already. Digging deeper, you may need to clear the cache on the Android Auto app on your phone.
It could be the new setting "block USB connections while locked". You probably need to unlock your phone or change that setting. I found it was preventing me from connecting to my external monitor without unlocking first.
