My friends have tried to join my world numerous times but they haven't been able to, even when our iOS and minecraft apps are up to date. For some reason I can join their worlds only (when i try to join the first time it doesn't let me, but then when i try again it loads perfectly fine the second time). I'm not sure how to fix this issue since we seem to be doing everything right. I have tried to make new worlds, restarted my app so many times, and made sure all of my multiplayer settings were on. I even tried looking up solutions to resolve this issue but nothing has worked for me and my friends so far.