Dolby Atmos for home theater not upmixing stereo games correctly

So after following up with the Dolby Access support team, apparently games aren't supported on home theater, only on headphones:

"Unfortunately, Games encoded with Dolby Atmos audio are not compatible with Dolby Atmos for Home Theater, as they are specifically configured for Dolby Atmos for Headphones. If the content you are experiencing is not compatible with the app you are
using, then audio will cease, or will simply output as regular stereo output.

To clarify, Dolby Atmos for Home Theater is included at no charge with any Dolby Atmos supported hardware, such as a receiver or Xbox One X, and is used to activate Dolby Atmos features via HDMI connection for a Dolby Atmos certified AVR, soundbar,
or TV."

"Unfortunately, the version of Dolby Atmos included with your Xbox is Dolby Atmos for Home Theater, which is not compliant with any gaming content."

It kind of strikes me as hard to believe, or that this won't be addressed, but that's what they're saying for now. That said, it still isn't working for me for Netflix content either, so I'm going continue troubleshooting with them and see what's doable
and what's not. Fingers crossed.

The Xbox audio settings I have available are as follows:

HDMI audio:

* Stereo Uncompressed

* Dolby Digital

* Dolby Atmos for Home Theater

Headset Format:

* Stereo Uncompressed

* Windows Sonic for Headphones

* Dolby Atmos for Headphones

* DTS Headphone:X

Tried all of them. Nothing helped.

Dumb question, but you do have the channel upmixer enabled under the home theater section of the Dolby Access app, right.

No im just using dolby atmos for home theater

Hi RomiDumitru,

*maybe* this "problem" is exactly how the Dolby Atmos App on Xbox One X works.

Dolby Atmos native content? perfect! Dolby Atmos playback.

No Dolby Atmos? the App upmix current audio track to Dolby Atmos (the headphones features works in this way).

I don't know if is intentional.