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WU_E_PER_MACHINE_UPDATE_ACCESS_DENIED
WU_E_PER_MACHINE_UPDATE_ACCESS_DENIED means the caller tried to work with per-computer updates without the administrative access required for that operation.
What to check
- Run the administrative update operation from an elevated process or management account with the appropriate local rights.
- Do not confuse per-user and per-machine update scopes; they have different access requirements.
- For scheduled automation, check both the task account and whether it runs with highest privileges.
Microsoft: WUA search scopes and enumerations
Microsoft: Using the Windows Update Agent API
Microsoft: WUA success and error codes
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