Dynamic Backgrounds are Live in Alpha Insider Build

Thanks Gerry, seems it is likely the Windows Insider build. I dropped back as far as possibly from dev builds without having to reinstall andstill issues. Seems it's any insider build

Surprised as the alpha and beta were absolutely rock solid in

insider.

Alpha/Alpha skip ahead is as far as i know by invite only. You should been an insider for a long time and give proper feedback to the builds.

The current Xbox Insider Alpha release build is RS_XBOX_RELEASE_2007\19041.3432.200623-0000 (2007.200623-0000)

Source:
https://news.xbox.com/en-us/2020/06/24/xbox-insider-release-notes-alpha-2007-200623-0000/

At this time, dynamic backgrounds are only available on the Series S/X and can't be customized. If the video you saw was done on a One, then the person doing it is doing something that violates the terms of service.

If you are on a Series S/X, when you go to settings and change your background, there's a section for dynamic backgrounds.

Fill out a detailed report, giving make and model of headset you use and send it to the development team.

I am in Alpha Skip ahead and sometimes get these issues. You could try backing out of the Insider program, to a public build and seeing if things work.

Remember Alpha and Alpha Skip Ahead are the cutting edge OS builds and can be full of bugs.