i do have an audio endpoint and everything works fine from a watch perspective. The Shield is connected to AVR via HDMI and is the audio endpoint for the room, tv is video endpoint for AVR. On a side note, I am able to add the Shield itself to the listen menu, but it does not turn on the tv. Thanks all for your help. I feel like it is a limitation of the driver, or I am missing something simple. Happy to try anything you are kind enough to suggest.
The reason for the question: We listen to music in all channel stereo. When clicking the listen button, the AVR switches audio modes. Right now, I have to hit watch amazon music then click the listen button followed by cancel on the remote. It works, I'm just trying to remove a couple of steps.