Carplay audio with new iPhone xs

Hello,

I received my iPhone Xs on Friday and after setup that night had my first drive. Carplay connected fast and I played a podcast seamlessly. However, when I made a phone call, although I connected, neither I nor the person I called could hear audio. I tried several x and she tried calling me with the same result. I have spent some time with Apple yesterday, and they aren’t giving up, but they are flummoxed at this point. BTW, I have hard reset the phone, rebooted it multiple times, restarted the car several x, changed USB cords, reset network, done all of the usual.

Thanks for any insight you may have.

Elizabeth Best