Hi, here are my settings for an Oculus Quest 2. I also have an HP Reverb.
The key point - in the Oculus app you must set the OpenXR runtime to Oculus (Set Oculus as active).
I use a link cable. You must enable Oculus link before starting Aerofly in Steam, and you must select "Launch Aerofly FS 4 in Oculus VR Mode".
If you do not enable Oculus Link first, or you try starting with Steam VR mode you will get an error.
I actually find getting up and running on a Quest 2 very quick and easy, although the HP Reverb gives me a slightly more high resolution picture in VR (but the heavier headset and bulkier cable offset this).