I want my old gamertag back

There's no way to know exactly how inactive an account is. It's possible their signing into their account on other Microsoft services which would keep it open.

I guess that's true. But he still only used the account to mod on black ops 2, he's either trying to sell the xbox tag or do something else with it.

It is because your name is too long

You have to cut off 2 digits since you now fall under the new rules

Next time.set a passcode

Hello Eitan!

My name is Dérek, I'm an independent platform consultant and I'm grateful for the opportunity to help you.

As this is the second time you make the gamertag exchange, you will have to make the purchase of the gamertag exchange ok?

This step by step is contained in this official microsoft link ok?

Here it contains the whole process, and possible doubts.

https://support.xbox.com/en-us/help/account-pro...

If you need any more information, would you be available to answer ok?

Im wanting my old gamertag back as my brother change it and it's a unauthorized change so I'm requesting my old gamertag back