Xbox Blu-ray app Dolby Atmos issue

Do you have a Dolby Atmos compatible receiver, sound bar, or speaker system? If you do, have you changed the settings within 'Disc & Blu-ray settings' on your Xbox One to enable 'Let my receiver decode audio'? Currently Dolby Atmos is only supported within
the Blu-ray app for Dolby Atmos compatible Blu-Ray movies.

Keep us posted!

Update:

I have now tried a 4K Blu-ray disk and can confirm that Dolby Atmos works with it. I used the AVR Key so HDR would go to my LG OLED TV and the Dolby Atmos Sound would go to my non-HDCP2.2 Marantz SR7009 Receiver. I now believe the problem is with the Dolby
Access App and not with the Xbox One X's operating system itself since the 4K Blu-ray would send its own Dolby Atmos track to the receiver bypassing the Dolby Access App. Where with Games and the Demo's in the Dolby Access App are using that App to process
the Dolby Atmos signal. Thus I believe it is a problem with the Dolby Access App, but i don't know how that ties into the operating system or how the Blu-ray player app integrates with the Xbox's operating system or bypasses it because of that pass-through
setting that lets the receiver process the Atmos Signal. Either way I have concluded there is nothing more I can do, it's definitely an issue with either the operating system or Dolby Access App having compatibility issues.

I can confirm this bug with the Dolby Atmos app.

My setup: Denon X4200W receiver with Xbox One S.

Atmos works fine in the Dolby Atmos app, Blu-Ray and Netflix (the movie Okja is the only Atmos movie on Netflix). All other Netflix videos and Xbox apps default back to 2.0 down mix as posted above.

Those are my exact settings already for both the audio and the Blu-ray player.

The Blu-ray player outputs Atmos correctly.

Its only the Atmos from the Dolby Access App and the other apps that will not play through all my speakers.

Is it a bug in the Xbox software or something else with my setup?

I have this same problem. I'm not getting the Atmos Bitstream from UHD Blu Ray discs. Games aren't a problem and the demo videos from the Atmos App work fine, i.e. my receiver shows Dolby Atmos. But when I play a UHD Disk from the Blu Ray app, it defaults
to Dolby TrueHD. I'm pretty sure I've narrowed this down to an issue with the Blu Ray player App. The only thing I haven't tried, which I will tonight, is to uncheck the "Let my Receiver Decode" check box. Which shouldn't fix the problem, but I'll try it
anyway.