If I do the Play Xbox activity on my Logitech remote, there’s no audio on the Xbox, if it’s set to Dolby Atmos. I have to toggle HDMI eARC to get it working.

The Xbox says Dolby Atmos is compatible, but doesn’t actually play any sound, until I toggle eARC.

No idea if a firmware update on the TV did something to break it, or it was never fixed. Might work if you do Watch TV or whatever, and then switch to Play Xbox. But not powering everything down.

Ha, a Vizio TV and Vizio soundbar, don’t play nice together. Good job Vizio. Or the Xbox is a dick. The Xbox also likes changing back to stereo.