I played minecraft since a lot of time, and I didn't have any errors but in 1.16.100 it  I can't join my friends world’s I know that is not the world of my friend because all my friends can join the world of my friend, but my friends can join my worlds, and I can join servers, I don't want the solution to be that y play in a world that I create because in that world we were so advanced and that world is very important, sorry if there is some spelling mistakes I am not from the USA