Unfortunately, Apple Music does not currently support Dolby Atmos on Xbox or Windows devices. I have been trying to figure out how to play music in Dolby Atmos on my soundbar, but even mirroring my iPhone and Android devices using a USB-C to HDMI cable doesn't work. The soundbar supports Atmos, but Apple Music on iPhone and Android automatically switch back to stereo as soon as I plug in the cable. Seriously disappointing, especially since Xbox is a device that is one of the few TV/home theater-connected devices supported by Apple Music that supports Dolby Atmos for other content. I shouldn't have to buy an Apple TV just to be able to use Dolby Atmos when I already have a home theater set up with a different device.