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WU_E_UNKNOWN_ID
WU_E_UNKNOWN_ID means a caller supplied an update, service, or other WUA object ID that the agent cannot find. The ID may be stale, refer to an item from another service, or have been removed after a catalog refresh.
What to check
- Do not cache WUA identifiers indefinitely; refresh the scan result before acting on a selected update.
- Confirm that the caller is using the same update service and search context that produced the ID.
- Inspect the preceding scan or service-registration event in the Windows Update log.
Microsoft: IUpdateSearcher::Search
Microsoft: Windows Update Agent API
Microsoft: WUA success and error codes
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