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Julia ThomasSep 12, 2025
What to do if my Brother MFC-J6920DW displays 'Authentication Error 03 Display name has already been registered'?
- TThomas KellySep 12, 2025
If your Brother All in One Printer displays 'Authentication Error 03 Display name has already been registered', it means that the display name you entered is already in use by another service user. To resolve this, simply enter a different display name.

















