Sorry for my bad English, I used Google Translate. The problem is that I can not connect to a multiplayer game through Xbox Live.
Do I understand correctly, that there are several ways to play online:
1) In a local area network (check, working)
2) Just find some server (check, working)
3) A Minecraft Realm (not checked, but I think works)
4) After the service Xbox Live (does not work)
How to solve the problem?
Xbox Live allows up to 5 people to play together.... but each player has to add each other to their Friends list, and once you start a game, send them an "Invitation" (or once they start a game, you get an "Invitation" to join). Pretty simple, really.