Same, 2019 Traverse. Carplay "Projection" is hit and miss whether or not my maps will appear but by far the MOST annoying part is when i hit the microphone button as though to give siri a command the "ding" happens and immeadiatly goes back to radio. It doesnt give me a change to talk. Ive restarted the car, reset the stereo, disconnected and reconnected, bought a new apple brand chord and to see if that would jumpstart something, prettymuch all but drive the car off a bridge and nothing. Apple and GM need to pull their head out of their keister and help us out.