Disclaimer:
I am using Proxmox VE but I had the same issue, In my case I had to plug in my Dummy HDMI plug then reboot the machine, setup Chrome Remote Desktop and check the Display Resolution after which I reinstalled driver and started moonlight client on my second machine and fired up Nvidia GeForce Experience in my VM and it seemed to do the trick. I use Parsec for gaming as I didn't have good "experience" with GeForce Gamestream.
I hope this method also works on your machine as we have similar issue(I used 650 1GB UEFI patched card).
Proof:
