Lessons Disappeared from Activities

Also, you mentioned before about having both the Steam version of MSFS2024 and the MS Store version. Firstly, make sure that you are using only one version of the sim. It can become very difficult as folder locations are different between versions.

Next, confirm the community folder path. You can do this by going to the Marketplace, in sim.

Marketplace → My Library → click the little cogwheel on the upper right of this screen.

That will show you the folder location