Ever since the error in August where a large number of players' names were changed to Guardian####, I have been unable to change my Bungie name back or to anything else. When I attempt to change it, it simply says [i]You can only change your Bungie Name one time[/i]," but I have never changed my Bungie name prior to this.
@BungieHelp last mentioned this on Twitter on October 8th. Is this issue still being investigated?
[quote]You can only change your Bungie Name one time,[/quote]
You have a token then, that's outdated text.
If the name isn't saving then you're picking something that's filtered and you need to choose something else. Variants can also be blocked at the same time as the main one so if you're just trying variants of a filtered name then they may also be blocked.