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STATUS_VOLMGR_NO_REGISTERED_USERS
There is no notification client for the task number to identify
STATUS_VOLMGR_NO_REGISTERED_USERS is a notification-state consistency error. With no registered users, a task number associated with notification delivery has no relevant client context.
The code should not be confused with an empty disk or empty volume list. It belongs to the management notification channel: Microsoft documents a client initialization path that establishes the callback used to receive Volume Manager changes.
Inspect the lifetime of the notification client. A service restart, explicit uninitialization, or reset can remove registrations while worker code still holds a task number from the previous session. The fix is to restore registration state and refresh topology, not to fabricate another task identifier.
What to inspect
- Confirm a notification user was successfully registered in the current client session before using task numbers.
- Clear task identifiers when the client uninitializes, reconnects, or handles a notification reset.
- Trace registration and unregistration together with process lifetime to find stale work crossing session boundaries.
References
- Microsoft VOLMGR entry for STATUS_VOLMGR_NO_REGISTERED_USERS.
- MS-DMRP rules for initialization, uninitialization, and notifications.
- MS-DMRP glossary for the volume manager service.
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