Same here I’m using gamepass version.
First start virtual desktop on your PC and your headset. Confirm you can see your desktop in your headset.
Start SteamVR in your PC. Your headset may now show the steam virtual room.
Now start MSFS.
Ctrl+Tab to switch to VR.
If it just shows a 2D stereo image then take left controller hit oculus menu button to see VD menu and click “Enter VR”
If that doesn’t work then download on Steam a demo game that can be played in VR and confirm that you can run Steam games in VR over VD.