I've been struggling to get my Minecraft Windows 10 Edition to work with my Xbox Live gamertag. Every time I try to play the game online (MCPE and MW10E servers) I get an error message: "Please choose a valid username". My gamertag is "Sem Games", and I am 100% sure that the problem is due to the space in the middle of it. Please, fix it! It's very effen annoying to have to use my brother's account to play the game (his username has no space and no special characters, it's just a regular username).