I believe the standard approach is to use the methods on AAIController: MoveToLocation or MoveToActor. You shouldn’t need to make any calls directly on the navigation system or path following component to achieve basic navigation.
However this may not actually be the issue. It’s possible the movement isn’t happening because your nav mesh is not being generated properly. I haven’t experimented much with the new dynamic nav mesh yet, but I think it can be a bit fiddly to set up correctly. If you’re using the dynamic tile generation you need to ensure you have nav mesh invokers set up. First thing to do would be to enable the navigation mesh visualization to check that the mesh is working (enter the command ‘show navigation’ in the console while running).