I think I am having a bug were that in the better together update on Xbox one. On the account that is the Xbox Live gold member on the system it says can't connect to Xbox live and can't connect to realms. The account who bought minecraft connects to live and can access realms and on the account that doesn't connect to minecraft servers it can connect to any other game multiplayer servers on any game on the system it is only affecting the better together edition of minecraft on Xbox one. Both accounts are set to the home console.