Hello.
I have the same issue.
i have a 3 channel dolby atmos soundbar connected to PC HDMI.
I have a 2 separate window installation. one is main drive run on latest build, other one run on latest fast ring, both have latest intel drivers installed.
Now I found the fast ring drive have 'Dolby Atmos for theater' under default format bar, and dolby atmos for home theater in spatial sounds. when I forced to click on dolby atmos for home theater under default format tab, is show 'format not supported by the device', then try to enable dolby atmos for home theater in spatial sounds, get the error 'something went wrong while try to tun on spatial sounds.
how to fix this problem?