So is Windows 11 officially supported?

The official MSFS site and FAQ say that the minimum OS is Windows 10 1909. What it doesn’t say is that Windows 11 is officially supported.

I know many people are running Flight Sim just fine on Windows 11, but can anyone confirm that it is officially supported?

Yes, it should be. Maybe some bugs here and there but those will eventually be fixed.

Only bug I’ve found on Windows 11 is in VR where there is a significant head shaking with very small head movement with the HP Reverb G2.