Xbox One doesn't allow me to change my gamertag?

Someone was trolling me and had my gamertag changed, by xbox live, twice. I paid to change it once, but was really PO'd about the fact that i was allowed to make the gamertags and yet still had to suffer microsoft's RNG. Its outrageous

The gamertag filter cannot catch everything that violates the code of conduct. So just because you were able to make one doesn't mean it's allowed. It still has to abide by the code of conduct you agreed to.

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?

[quote user="Rich Cashster"]I am allowed to change my gamertag on xbox one, one time for free. Is this correct?[/quote]

No. The policy on name changes is the same as on the 360. One free name change when you create the gamertag, then $10 after that.

[quote user="Rich Cashster"]If so, this only changes my name and doesn't reset my achievements or anything, correct?[/quote]

Gamertag changes only affect the name of the gamertag. Achievements, game progress, online rankings, downloaded content, system settings, etc, will all remain exactly the same.

No, I don't want to change my gamertag. I've got two gamertags. One for Japan and one for the US. Unfortunately, Microsoft won't allow me to change locales with gamertags. My main Microsoft account that I use now in the US is associated with my Japanese
gamertag, and I want to switch it with the US one.

EchoxWindwaker doesn't sound like one of the randomly generated ones.

Newer accounts allow you to put in a gamertag to begin with, but don't grant the name change. Older accounts, with a randomly generated gamertag, get a free name change.