HRESULT 0x80240013 (WU_E_DUPLICATE_ITEM): meaning and diagnosis

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The operation attempted to add the same item to a Windows Update Agent collection more than once.

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WU_E_REG_VALUE_INVALID	WU_E_INVALID_INSTALL_REQUESTED

WU_E_DUPLICATE_ITEM

WU_E_DUPLICATE_ITEM is most useful to WUA API callers. The caller attempted to add an item that was already present in a WUA collection, such as a download or installation list.

How to prevent it

Deduplicate update identities before adding them to an IUpdateCollection.
Do not merge results from overlapping searches without checking update IDs.
Log the update ID, revision, and source service when building an installation set.

Microsoft: Windows Update Agent API

Microsoft: Using the Windows Update Agent API

Microsoft: WUA success and error codes

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