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WU_E_UPDATE_MERGE_NOT_ALLOWED
WU_E_UPDATE_MERGE_NOT_ALLOWED indicates that the caller or servicing workflow attempted to merge an update where merging is not permitted. This is an update-state or deployment-model constraint, not a transport issue.
What to check
- Identify the update relationships and whether the workflow is explicitly installing merged updates only.
- Verify the update’s applicability and approval state before retrying.
- Use the Windows Update log to determine why the merge operation was selected and which item was rejected.
Microsoft: Windows Update error reference
Microsoft: Windows Update log files
Microsoft: Windows Update Agent API
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