My Xbox 360 and Xbox One Gamertags are separate - Microsoft Community

How to Change Your Xbox Gamertag on PC!

How to change your Xbox gamertag

What's a gamertag? - Microsoft Support

Latest Xbox One Preview update adds a way to manage leftover game add-ons

I seem to have two different gamertags on the same account, and I'd - Microsoft Community

filestore.community.support.microsoft.com/api/imag

I can't be the only one that thinks this is a little unnecessary. : r/xbox

Still want a 15-character gamertag? Use an Xbox 360 to create it

Im trying to sign into xbox live with my microsoft account but it keeps saying is invalid btw i never owned an xbox 360, im using my xbox 1 console microsoft account.