Hey everyone, we hope you’re loving the new forums!
Some users may have logged in today to see that their username here in the forums has been changed to match their gamertag. We had to implement this policy because of a login bug related to usernames that was affecting a few thousand forum users. From now on, users will have their gamertags as usernames.
There is no plan to reintroduce the ability to change your username here on the forums. However, we welcome your feedback on this change.