| Previous | Next |
| WINBIO_E_DUPLICATE_TEMPLATE | WINBIO_E_SESSION_BUSY |
WINBIO_E_INVALID_OPERATION
WINBIO_E_INVALID_OPERATION means the API call is not legal in the current state of the biometric session or unit. Common causes are calling operations in the wrong order or using a session opened with incompatible flags.
What to check
- Check the required operation sequence for the API, especially around enrollment begin, capture, commit, and discard.
- Verify that the session type, pool type, and access flags match the operation.
- After cancellation or device changes, reopen the session instead of continuing with stale state.
Microsoft: Windows Biometric Framework client error codes
Looking for a different code? Search another status or error code.