so I have no problems at all with virtual desktop and Quest 2 / Steam VR !
have you enabled developer mode in the Oculus app ?
Firewall, router - must of course be in the same network, so the PC and the headset - oculus link tried ?
for me both works and almost without latency loss !
tried sidequest with oculus link ? if the headset is not recognised with virtual desktop, it can only be due to the network settings ! Virus scanner active that might be blocking something ?