No audio on new soundbar for DVD

Any new update on this situation. I have an LG CX hooked up to a Samsung Q90r soundbar. If the Xbox is set to Dolby Atmos there is a noticeable delay. Unfortunately on the LG OLED and the soundbar you can not reduce the audio delay so you can only further increase it. However if I choose 7.1 uncompressed I have no issues.

I have a Vizio soundbar connected to my TV. I ran the Audio Receiver Setup on the Xbox One and now the X1 powers on/off the soundbar along with my entire TV/DVR system.

As for volume control, if you've ran the Audio Receiver Setup then you can control the Soundbar via either voice commands or the Xbox One Smartglass App (the volume controls on Smartglass will no longer control the TV volume, however, as they'll become dedicated
to the soundbar--I presume the same may be me true for voice commands).

What features? The video feed is going straight into the TV. It is just the audio going to the soundbar from the TV.

4K at 120hz

If the sound bar uses HDMI 2.0, the TV will only be limited to 4K 60hz,

The video feed is not going into the soundbar. It is going into the TV. Hence all HDMI 2.1 features work as normal.

The TV returns the audio feed to the soundbar via eARC which does not require HDMI 2.1.

I have the same problem with My xbox one x and 950 soundbar. I get audio delay once I enable Dolby atmos via the audio settings on my hdmi, but the soundbar works great with all other devices, cable TV, apple TV 4k. I've literally tried everything and
I'm thinking is has something to do with the Dolby atmos application. I've used optical and other sources and they sound good, obviously not Dolby atmos but they work. I don't think it's my TV or soundbar. I've also replaced the xbox one x to a new xbox one
x and same issue. It has to be a bug in the atmos connection from the speakers to the xbox. It's super frustrating. Not sure what else to do until I new update comes out.

For reference, HDMI ARC is meant for a TV to send the sound it receives from something like its digital TV tuner "upstream" to your soundbar.

The way you have it set up physically is correct, just that its not depending on ARC (Xbox One audio gets stripped from the HDMI cable by your soundbar and sends the video onto your TV).

Try changing the audio setting on the Xbox One to Stereo Uncompressed, make sure the soundbar isn't muted, etc. Maybe your Soundbar doesn't support 5.1 uncompressed, but 5.1 compressed Dolby Digital or DTS.