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WU_E_SIH_ACTION_NOT_FOUND
WU_E_SIH_ACTION_NOT_FOUND means the SIH client could not locate an action expected by the servicing response. This points to a client/server compatibility or response-processing problem, not to a normal update download failure.
What to check
- Capture the SIH task event and surrounding Windows Update log entries, including the service and target metadata version.
- Check whether the device is missing a prerequisite Windows servicing update or is using an unsupported management configuration.
- Do not attempt to create or edit SIH actions manually; resolve the source or client compatibility issue.
Microsoft: SIH client diagnostic event fields
Microsoft: update Windows Update Agent to latest version
Microsoft: Windows Update error reference
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