My xbox gamertag

I'm trying to change my classic gamertag which is the one you see in games. My classic gamertag got changed and my Xbox One and Xbox App gamertag stayed the same (the Xbox One gamertag is the ones they added with the new gamertag system).

My Xbox One gamertag is different to my in-game gamertag and I want my classic gamertag to be changed. You can only change your classic gamertag on the Xbox One console, I have tried using the other ways and you can only change your Xbox Gamertag, not your
classic gamertag.

The reason I want to change my classic gamertag is that the classic gamertag can be fifteen characters and the Xbox One gamertag can only be 12 characters. If I use the other ways to change my gamertag it limits me to 12 characters and sets both my gamertags
to that.

Just to clarify...when you say all licenses, you mean all licenses for that gamertag regardless of which xbox purchased it? I was hoping to leave the licenses on the other xboxes. If I bought my daughter a game on her xbox under my gamertag and one for
everyone in the livingroom under my gamertag...if I do a transfer under my gamertag to my xbox in the bedroom no one can play the game under THEIR gamertag on their xbox anymore? Is there anyway to do a license transfer that DOESN'T merge ALL licenes?

Here's a guide to changing your gamertag on the Xbox One:

support.xbox.com/.../xbox-one-change-gamertag

Hi, for some reason my old gamertag is showing on the xbox app, yet I changed my gamertag ages ago. Is there any reason why my old gamertag is showing on the xbox app rather than my new gamertag?

Try signing out and then signing back in.

You can
change your gamertag on your 360 and you can
change your gamertag on your Xbox One. Those are currently your only options.