Create new realm generates error "The Realm name xxx is not allowed." This occurs no matter what name I give the realm. Have made sure the xBox profile has multiplayer, clubs, etc. all allowed and is an adult, primary account. Have created a new account just to be sure, and get the same problem with it. Parent of kid's friend has identical issue on iPad. Looking online, this seems to be very common problem and does not seem to have been solved.