Can you please post your Playback devices?
I have the same problem with another person and I found the conflict between NVIDIA HD audio drivers and Realtek doing some bizarre conflicts.
What we did with him was to guide him to perform manual driver clean up.
We installed the last version of RealTech and Chipset specially build for windows 10.
Asrock released only and only the
Realtek driver for windows 10.
Here is the method for installing
NVIDIA OldGaryGary mention
View attachment 20074
Please install that and post the playback device you shouldn`t see NVIDIA HDMI in there.
If the driver doesn`t help I will post you the command line you need to post so I can create a fix for the manual driver removing.
Many thanks for you patience and cooperation,
Andy