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WINBIO_E_UNSUPPORTED_POOL_TYPE
WINBIO_E_UNSUPPORTED_POOL_TYPE is a capability mismatch between the requested pool type and the biometric factor/provider. WBF organizes units into system, private, and unassigned pools, but support for a client operation is not inferred solely from the presence of a biometric device.
Verify pool semantics before opening the session
- Log the biometric factor,
PoolType, flags, unit array, and database ID used for the session request. - Use the system pool for Windows authentication scenarios and a private pool only when the application actually owns selected units and an application database.
- Check platform restrictions for newer secure sensors; Microsoft notes that the classic WinBio API surface is not supported for ESS fingerprint sensors.
Changing WINBIO_POOL_SYSTEM to WINBIO_POOL_PRIVATE is not a generic compatibility workaround. Private pools reserve units exclusively and use different identity/database semantics. Select the pool from the application architecture, then verify that the biometric factor supports that design on the target platform.
Sensor pools · Creating a private sensor pool · Enhanced Sign-in Security
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