Hi there, Thank you for reaching out to us. We understand that the four digits assigned to your username changed when you changed your username. Please be advised that this would be intended. As per our [url=https://help.bungie.net/hc/en-us/articles/7648312251284-Bungie-Name-Guide]Bungie Name Guide[/url]: [quote]The Numeric ID in a Bungie Name cannot be manually changed and will only update when a name is changed; then the Numeric ID will automatically update to a random set of numbers.[/quote] We hope that this alleviates any concern about the four digits in your username changing. If, however, you are encountering an error message of some kind, then please clarify this and we'll review.