I had a bit of trouble as well and this is how I do it after messing around for a bit…
I should note that I tried the OpenXR route but am using SteamVR due to the Headset not found issue.
Start Virtual Desktop on desktop
Start Steam VR beta
Start Virtual Desktop in headset (You may have to select the Reset Headset option that comes up in the Steam VR window on desktop)
You should be viewing your desktop from your headset at this point, no need to remove headset.
Launch MSFS from your desktop link or start menu (I have not tried launching from Steam directly but should work).
Now you should see the loading screen through your headset
Pick your flight while still in 2d mode.
Click Fly.
Once you’re in the cockpit, hit ctrl-tab to switch to VR or hit esc and go to options - VR settings and Switch to VR from there.
If it comes up stereo image or not in VR, Click the menu button on your left controller to bring up the Virtual Desktop options in your headset. There should be an option for “Switch to VR” on the left hand side.
You should be all set
*If you never see the loading screen or MSFS through your headset, close MSFS from desktop and relaunch from your desktop through your headset… if that makes any sense lol
When I said I’m using SteamVR, I was referring to the OpenXR runtime setting:
