Ah I see, I asume you do have the MS Store version. Installed the simulator default as is on C: - right?
Per default you do not have rights on the community folder where it is placed per default. So you first need to get rights for the folder (even as admin, btw running user software as admin is no good advice and MSFS definitly does NOT need to be run as admin → so don’t, this can mess things up).