I was planning to change my gamertag. I checked if the name was available, and it was. So I go to change it and it says it's already being used? I even added the name and it even says it doesn't exist.
I can't change my Gamertag (GT). Most of the time if you are seeing a message saying the GT you want is unavailable, it’s true. One thing to remember is that spaces and capitalization don’t make your GT unique. For example, “Major Nelson”, “MajorNelson”, and “MaJoRnElSoN” are all the same
GTs are also tied to services like Zune or Games for Windows LIVE. If a GT doesn't exist on Xbox, it might be in use on one of those services. If you try sending the GT you want a friend request and it says it’s not a valid GT that just means it isn’t
used on Xbox LIVE, but it could be used for Zune or GFWL.
I heard old GTs are being re-added. When will "This GT" be available? There is no schedule or estimated dates for when certain GTs will become available again. GTs are not an on-demand service. They will be available when they are available.