Are you using MSFS 2020 with steam or MS store?
Have you got Virtual Desktop for the Quest 2? and downloaded VR streamer app on your PC?
Mine works 99% of the time on Quest 2 with link cable to PC and registry edited in the Kronos OpenXr
_ 1 folder
C:\Program Files\Oculus\Support\oculus-runtime\oculus_openxr_64.json