What does HRESULT 0x8009804F (WINBIO_E_CALIBRATION_BUFFER_TOO_SMALL) mean?

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the calibration buffer size is below the range accepted by the biometric calibration path.

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WINBIO_E_UNSUPPORTED_SENSOR_CALIBRATION_FORMAT	WINBIO_E_CALIBRATION_BUFFER_TOO_LARGE

WINBIO_E_CALIBRATION_BUFFER_TOO_SMALL

WINBIO_E_CALIBRATION_BUFFER_TOO_SMALL is about the size of calibration data exchanged between the engine and sensor adapters. During dynamic calibration, WBF supplies an engine callback with a bounded output buffer and later passes the produced data to the sensor adapter.

Check produced size against the negotiated contract

Log MaxBufferSize and the final CalibrationBufferSize reported by the engine adapter.
Verify the engine does not truncate a required calibration record merely to fit the current allocation.
Confirm the sensor’s accepted calibration format defines the same minimum payload layout as the engine is producing.

Microsoft states that the engine-reported calibration size must not exceed MaxBufferSize and that a zero size means no calibration update is needed. A nonzero payload that is too small is therefore a format/content contract problem, not a request to treat missing bytes as optional. Preserve the exact selected format and byte count in diagnostics.

Engine calibration data callback · Sensor calibration data callback

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