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WINBIO_E_SESSION_BUSY
WINBIO_E_SESSION_BUSY means a session cannot start a new biometric operation because an earlier operation is still active. This is a session-level concurrency condition.
What to check
- Wait for the pending operation to finish, fail, or be cancelled before issuing another request.
- For asynchronous code, serialize work through the completion callback or event result.
- Use separate sessions only when the device and pool configuration support concurrent work; otherwise coordinate access at the application level.
Microsoft: WinBioCaptureSample
Microsoft: Windows Biometric Framework client error codes
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