I tried to plug the PX4 into the Xbox One today, and the sound works nicely. Problem? NO CHAT over the damned headset. Instead they want me to talk into my Kinect? wtf?
There's an option to "Use Kinect for chat", perhaps if you uncheck it?
Without the new headset adapter doohickey, the microphones on many headsets can't be used at all. As a workaround you could use the Kinect mic to transmit and still receive chat audio over your headset. That setup actually did work a lot better than I expected, but it was hardly ideal.