HRESULT 0x80098039 (WINBIO_E_EVENT_MONITOR

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the session already has an active WinBio event monitor registered.

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WINBIO_E_NOT_ACTIVE_CONSOLE	WINBIO_E_INVALID_PROPERTY_TYPE

WINBIO_E_EVENT_MONITOR_ACTIVE

WINBIO_E_EVENT_MONITOR_ACTIVE is returned by WinBioRegisterEventMonitor when an event monitor is already active. The registration is session state, so calling the registration function repeatedly does not add a second independent callback.

Track monitor ownership per session

Store whether registration succeeded for each WINBIO_SESSION_HANDLE.
Call WinBioUnregisterEventMonitor before registering a replacement monitor on that session.
Use a separate biometric session if the application must perform normal WinBio operations while an event monitor remains active.

Microsoft notes that a session with an active event monitor cannot process other Windows Biometric Framework API calls until the monitor is stopped. Event callbacks are also delivered serially and may lose later events if the callback performs lengthy work. This HRESULT therefore usually exposes a lifecycle bug in session ownership, not a sensor problem.

WinBioRegisterEventMonitor · WinBioUnregisterEventMonitor

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