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WU_E_ITEMNOTFOUND
WU_E_ITEMNOTFOUND means a WUA collection lookup did not contain the requested key. A stale update ID, changed service selection, or an assumption that a scan result is still current can cause it.
What to check
- Refresh the relevant collection or scan result before looking up an item.
- Use stable update identifiers and record which service produced them.
- Handle a missing item as a normal API outcome where a catalog can change between search and action.
Microsoft: IUpdateSearcher::Search
Microsoft: Windows Update Agent API
Microsoft: WUA success and error codes
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