I am very disappointed there is no Dolby vision HDR support for Blu-ray Player app on Xbox...

Thanks for the quick reply. Can you tell me if support for 4K HDR Dolby Vision for the Blu Ray player is a recent firmware update? The reason I ask is that all the info and reviews I have read say that the Blu Ray player only supports 4K UHD and not 4K
HDR Dolby Vision. Thanks again.

Yes, 4K HDR Dolby Vision works with the Blu-Ray player and NetFlix on the Xbox One X.

Yes, please bring Dolby Vision support to the Xbox 4k Blu-ray player! I have a vast collection of 4k Blu-Rays and a tv that supports Dolby Vision (LG C9).

I have a XBOX One X connected to an OLED LG C8. If I use the Netflix app on XBOX One X then the LG will display Dolby Vision. So I know that it is passing. But If I use a 4K Bluray that has Dolby Vision, the player will only output HDR。Blu-ray
playback is already up to date.

Of course the Blu-Ray disks I'm using are UHD and have Dolby Vision.

Dolby Vision is enabled on Xbox One X settings, TV HDMI ports are in Enhanced mode (4:4:4 4K/UHD HDR 60Hz), and the TV test (that can be found inside Xbox menu) returns all green ticks for my Xbox-to-TV connection.

As said, Dolby Vision works with all streaming apps... but not when playing Blu-Ray UHD Dolby Vision disks.