I have a workaround that I was able to just do a few hours ago (for issues around it saying you do not have any changes available or you cannot change your name).
Steps require using a Chrome or FireFox browser on a computer (or any browser with a Dev Tool):
1) login to your account and go to the account settings page with the user name field.
2) Right-click on user name input field and select “Inspect Element”.
3) In the element inspector panel that opens, you should have the username input field selected.
4) find the “disabled” tag, and double click to highlight it, and press delete key to remove this disabled tag.
5) Now you will be able to type in the input field up on the page.
6) Change your name and hit Save.
Remember it will only work one time!! So be sure you type it correctly.
I didn't find this out, FunPolice#8072 found this and im helping people with it, if you want to thank someone thank him :)
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Hmm, I tried this, but there is no "disabled" field at all. :(
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are you doing it on chrome? or something else