My mobile friends can’t join my game

I don’t think servers would be full if my friends game that he created only had 2 ppl in it. I was able to join on mobile, but couldn’t figure out why I couldn’t join on Xbox.

Not long ago my friends would always be able go join me, both Xbox One and Nintendo Switch, however now they can”t join me no matter what, I’ve changed the way of joining which is “Friends of friends” to “Friend only” to “Invite only” and nothing works,
they all get the message “Unable to connect.”

Playing on Xbox One

Yes, i have all theses things ok

And the problem is only when we try to join other friends worlds, but in servers and realms it works.

About the crossplay, i bought the game for android for knowledge about if i could join my friends game from the mobile to the xbox. Didn't worked either.

My friends list is still missing, my friends can join my party and my games, but i cant join theirs, nor does my xbox say they are even my friends

In other games too. After router restart no change. When he join to me result is the same ,,Notice - the game session is no longer available´´ ..One friend join to me and I to him. But second friend can´t join, I too. Advise me. thx.