What does HRESULT 0x80098034 (WINBIO_E_SENSOR_UNAVAILABLE) mean?

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Description:

a requested private-pool biometric unit is unavailable when the session is being opened.

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WINBIO_E_CONFIGURATION_FAILURE	WINBIO_E_SAS_ENABLED

WINBIO_E_SENSOR_UNAVAILABLE

WINBIO_E_SENSOR_UNAVAILABLE has a documented WinBioOpenSession condition: the caller requested WINBIO_POOL_PRIVATE and one or more units selected for that pool are not available. This is a pool-allocation problem, not a generic “fingerprint reader not found” result.

Validate the requested private pool

Log the complete UnitArray and UnitCount passed to WinBioOpenSession.
Enumerate currently attached biometric units and confirm that every requested unit ID still exists.
Check whether a unit has been assigned to another pool or is reserved by a different private-pool configuration.

Private pools reserve biometric units for exclusive use by the client application. Microsoft also notes that units return to their original pools when a private pool is released. Diagnose availability at session-open time and avoid silently dropping unavailable unit IDs, because doing so changes the set of sensors and database behavior the application intended to use.

WinBioOpenSession · Private sensor pool

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