If you registered your account to do a name changes, it will not work anymore. Its a game glitch
The only way to do name changes, are if you registered the e-mail when first creating your account. If you used the channel command to add e-mail after registering its too late
Either create another account, or expire it and re-create using e-mail when creation prompt. Opening a request on tech support will not fix it (its been like that for a while and they don't care)