Dolby Atmos no longer working on Xbox One X with Samsung 800T Sound Bar

I have a Samsung Sound Bar with Dolby Atmos. All works fine on the Xbox One X with Netflix, Amazon Prime, gaming and the Dolby Atmos app. Doesn't work with the Disney Plus app though. Sound isn't coming through the rear speakers and sounds very ordinary.
I go and do the Atmos tests and demos on the Dolby Atmos Xbox app and they work and sound awesome.

I've googled around and apparently lots of people are having the same issue with the app. Hope they fix it soon as I was planning on watching the Star Wars trilogy in 4K and Atmos. I'll wait until they fix it.

I see the Dolby app for installing ATMOS for headphones or speaker use on systems from 2 years ago and have also seen some comment that it just started working. Here is question: Bought Xbox One X last week (Feb 29, 2020) and have a Samsung 4k television
as well as their best Samsung Sound Bar with built in ATMOS. Do I still have to download the DOLBY app and install per some online instructions from past or is it all compatible now without any modifications?

I saw a lot of problems with the Dolby app in comments...so dont want to mess anything up. I downloaded INSECTS and the spatial sound selection was not available....so assuming that means I need the Dolby app installed.

Thoughts?

You absolutely MUST install Dolby Atmos App, you must also connect the Xbox One X directly to the SoundBar Atmos enabled and the soundbar to the TV, because Samsung TV don't have Dolby Atmos Passtrough.

Hi Napalm

Because my tv set Samsung is not so new and doesn't decode Dolby Atmos that is the reason for which I bought the XBOX ONE X to install the Netflix app in Xbox and to take out the Dolby Atmos from Xbox in Onkyo amplituner.

Now, when I open the Netflix app on Xbox I can see which movie has or not the sound in Dolby Atmos. This feature can't see directly on Netflix app on Samsung because tv set Samsung is an old version and doesn't have eARC.

Now, like I said ALL the GAMES and ALL the movie (Netflix) played on XBOX are in Dolby Atmos , no matter that they are or not in that sound format. THIS IS THE "PROBLEM".

Thanks

Romeo

My Xbox One X is connected to my receiver. When I try to setup Atmos in the audio settings Xbox One X says that my receiver, Denon AVR-4300H, does not have Atmos capability. I am only allowed to choose DTS for the bitstream sound output. Atmos works fine
with my Samsung 4K player so I know it is an Xbox One X issue.

The Dolby App does not give any error until I try to view the demo videos where it flashes, "you are not viewing this video on Dolby Atmos." It plays the demo video on DTS instead.

***UPDATE***

I finally got Dolby Atmos to work!!! Under "Settings, Display & Sound, Volume, Setup TV & AV Control, Audio" I had to change the default "Stereo" setting to "Surround Sound." The Xbox One X had to reboot to accept/change the setting. Once it rebooted Dolby
Atmos was working. It is interesting that the main control will be under the volume settings instead of audio output. You would think the system will be smart enough to activate surround sound when you are choosing Dolby Atmos to bitstream.

Hopefully this "difficult to find" change of setting will work for others who are having Dolby Atmos issues.

My Xbox One X is connected to my receiver. When I try to setup Atmos in the audio settings Xbox One X says that my receiver, Denon AVR-4300H, does not have Atmos capability. I am only allowed to choose DTS for the bitstream sound output. Atmos works fine
with my Samsung 4K player so I know it is an Xbox One X issue.

The Dolby App does not give any error until I try to view the demo videos where it flashes, "you are not viewing this video on Dolby Atmos." It plays the demo video on DTS instead.