Remark, I need you to update your "Username/Login Name" & your "GamerTag" on your profile.
GamerTag - Click "About Me" on your profile (directly above), then click the yellow pencil next to "GamerTag", update it and then "Save".
Username/Login Name - Click "Help Desk" on the top right corner, click "Request login name change", type in your name EXACTLY as your new GamerTag is spelled, then submit the request.
Thanks,
KoG FaceUp XS