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WINBIO_E_DEVICE_BUSY
WINBIO_E_DEVICE_BUSY means the sensor is currently occupied by another operation or client. It is normally a concurrency or timing condition, not proof of a failed sensor.
What to check for WINBIO_E_DEVICE_BUSY
- Retry only after the active operation has completed; avoid a tight retry loop.
- Check for another sign-in, enrollment, diagnostic, or vendor utility using the same reader.
- Make sure application code unlocks the unit and closes sessions after it completes work.
Microsoft: WBF client error codes
Diagnostic discriminator: Check concurrent biometric operations and session ownership at the sensor. This status is a temporary busy condition; it does not by itself indicate sensor hardware failure.
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