HRESULT 0x8024800E (WU_E_DS_ROWEXISTS): meaning and diagnosis

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Windows Update could not add a row because another row already had the same primary key.

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WU_E_DS_NOCATEGORIES	WU_E_DS_STOREFILELOCKED

WU_E_DS_ROWEXISTS

WU_E_DS_ROWEXISTS means Windows Update attempted to add a duplicate record with the same primary key to its data store. It can result from repeated metadata delivery, an incomplete transaction, or a client-side state mismatch.

Useful checks

Look for the update, category, service, or metadata object involved before the duplicate-row message.
Check whether the operation is being retried concurrently by management tooling.
If it repeatedly affects the same update source, investigate synchronization or local-store consistency.

Microsoft: Get-WindowsUpdateLog

Microsoft: Windows Update error reference

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