Username Change Not Working?

So every single time I try to change my username, I get the "oops, something went wrong" notification. I've been trying since it was implemented, and it has yet to work. I'm on mobile, if it makes a difference, no computer at the time.

Huh, is this bug still there? I had the same problem months ago. You might be able to get Rorie to do it manually like he did for me.

Seems to be busted, I had this problem forever, I eventually just PM'd Rorie on the site and he changed it for me.

Oh, you need to be premium though I think.