Age of Empires III: Definitive Edition runs Xbox gamertags and Steam profile names through an automated text moderation system. If the system finds text in the name that may be inappropriate, the username will be replaced with pound signs (#) in-game.
Since this is an automated moderation system, there may be times when a username is flagged incorrectly. If you believe this is the case, please reach out to our Support team. We will review the username and can grant an exception if no inappropriate text is found.