Change only legacy gamertag

For example in the app you can see both my tags





I want to change just the second tab, but there is no option to.





To get here I had to change my username to 2 then I was able to choose a different legacy tag, but that means I have to change my main tag twice to a temporary, then st it back.

You're not understanding his question. It's not a question of a gamertag being in use, it's the fact that you are unable to change the legacy gamertag without first changing your new gt that can be whatever you choose. Only then can you hit customize on the legacy tag, which is still the primary tag in games. In his case he has the tag he wants therefore he isn't able to change the tag progressing him to the needed screen to customize the legacy tag. The problem is Microsoft added a "new" gt system without removing the previous then screw it up further by only allowing one to be customized.

Because it's there for legacy compatibility with games that will break with the new format. All changes to gamertags now use the same system that includes the numbers.

Yes one legacy and one based on the new system

Legacy is your previous gamertag

I checked somewhere and it says the name isnt in use. Either way if it was taken I would like to change it to something else