Issue with "This gamertag isn't allowed. Try a different one."

https://social.xbox.com/changegamertag

If the link above does not help, i have had issues with gamertags and found a way around this.

Use a xbox 360!

It allows a longer gamertag creation for some reason and can work to change if you cant online or via xbox one.

Hope this helps.

But the gamertag that I want to change is my old gamertag. I change my old gamertag on 2 August 2020. I used that old gamertag when I create my Xbox account. At that time, the system allow me to use that gamertag. But when I want to change it back, the system don't allow me to use it. Why is this like that?

Hi! My name is Pam. I'm an Independent Advisor and I'll be glad to help you today.

I'm sorry to hear that. Please don't get me wrong but I'd like to be honest with you that there are certain reasons as to why it isn't allowed and it's the enforcement team who decides. Most likely, a letter combination is not allowed or it's a gamertag of a banned account. I hope you understand.

First, I'm just a gamer like you and I don't work for Microsoft. This is the community where gamers assist gamers. Secondly, I'm sure that there's no way around this and support can't assist with this either. I speak from experience. Once the system says the tag is inappropriate, you just have to edit it or choose a different one completely

Hello, My name is Jesse. I'm an Independent Advisor and a member of the Microsoft community and I'd love to assist you today.

Microsoft can at any time deem a gamertag harmful or inappropriate (even if the “Change gamertag” tool allows it to be created), and that gamertag can be changed automatically without any warning.

See more here https://enforcement.xbox.com/en-GB/home/staysaf...