I am seeing this same problem when working with Xcode Version 15.0 (15A240d)

My app needs to be the primary audio source because it's a conversation that should not be interrupted or delayed by another primary audio source. I just do not understand how the now-playing deck is usable or not usable given the text in the documentation. It would be helpful to have a CarPlay engineering viewpoint on how to work through this.

My Application is an audio application. It receives audio over the internet.