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The following types of user accounts in your organization are displayed as Unknown User in Microsoft Teams:
- Deleted user accounts
- Disabled and re-enabled user accounts
This behavior is by design.
If a user account is deleted from your organization, the display name will permanently appear as Unknown User.
If a user account is disabled and then enabled again, the display name will temporarily appear as Unknown User. Typically, this behavior lasts for about two weeks before the display name updates automatically. To force a quicker update of the display name after re-enablement, the affected user can sign out of Teams and sign in again. Their display name will then update after 72 hours.