How can I get Voice Chat only in headphones on ATMOS Home Theater setup?

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.

Did you download the Dolby Access app? While you only need to pay for use with headphones, you may be able to set up Atmos for home theaters with the app.

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.

Since you're saying Atmos works on the other apps installed on your Xbox I believe it's Netflix's responsibility to fix their app. I have an Xbox One S with the Dolby Atmos app installed. I've enabled the Dolby Atmos Headphone feature and set it in my Xbox
Settings. Upon doing this, the Netflix app would never get passed the loading the screen (the N). Eventually it would time out and give me an error message. I tried rebooting, cache clearing, reinstalling, etc. This was with me launching Netflix with my headphones
already plugged into my wireless controller. So I tried unplugging my headphones before launching the Netflix app... which redirected my audio to my 7.1 receiver (not Atmos, but I don't have home theater Atmos enabled in the Dolby app anyways) and that worked.
Netflix would open again. I then plug my headphones back into my controller and launched Our Planet to see if the Atmos badge would show up, which it did indicating the Netflix app had successfully detected my Atmos (for headphones). I'm assuming the Netflix
app upon loading, goes through a detection of your current setup and someone in that process the settings I had caused it to just spin until the timeout occurred.

Couple questions for you. How are your headphones connected? Via your receiver or via your controller? Also, how is your controller connected? Wireless or wired?

Headphones are over rated unless you have to watch for noise. You want the best sound? Invest in a nice home theater setup. Not only do you get the window shaking bass from explosions, but you get the joy of ticking off the guy on the next block. Lol.