October 4th Xbox Insider Release Notes – Alpha Skip Ahead Ring (2004.191002-2100)

This is fixed. See notes at ASA Alpha Insiders release notes and News.xbox

Hi,

you can change rings in the xbox insider hub when yo manage the xbox update preview rings note that alpha and alpha skip ahead are invite only but you should be able to join the beta ring

This is due to a new Store setting where audio for Autoplay videos is off by default. You will need to enable this setting to fix the behavior. Read more at Xbox
Wire. There is a fix for it that has just been released to Xbox Insiders (Skip Ahead ring).

"xbox not being able to play dolby atmos"

According to the Latest Alpha skip ahead Insider release notes this is still an issue the engineers are tracking and working on.

The new update is only out for some Alpha & Alpha skip ahead insiders at the moment.

If you're in the Omega ring then you'll probably be the last ring to get the update before it's released to everyone.