The "Fly" console command doesn't work

The “Fly” console command doesn’t work. I also can’t fly around when I’m using the “ghost” console command.
I’m doing something wrong? Do i have to activate some kind of option or something?
Sorry for this stupid question but I’m a beginner

Having the same problem. Did you ever figure this out?

This is the actual unreal system, the fly only allow you to walk on non-objects, not noclip.