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WINBIO_E_DUPLICATE_ENROLLMENT
WINBIO_E_DUPLICATE_ENROLLMENT means the requested identity and sub-factor already have a template in the selected biometric database. It prevents a second enrollment from creating an ambiguous duplicate.
What to check
- List the user’s existing enrollments before starting a new one.
- Remove or replace the old enrollment only through the supported UI or management API when that is intended.
- Check whether the application selected the same finger or other sub-factor twice.
Microsoft: Windows Biometric Framework client error codes
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