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WU_E_NO_USERTOKEN
WU_E_NO_USERTOKEN means the Windows Update Agent needed a user security token for the requested operation, but it did not have one. This is usually relevant to a per-user update, an interactive update action, or automation running outside the intended user context.
What to check
- Determine whether the update is per-user or per-machine; WUA distinguishes these search scopes.
- Run automation in the intended security context rather than assuming a background service has the current user token.
- For a scheduled task, check whether it runs when the user is logged on and which account owns the task.
Microsoft: WUA search scopes and other enumerations
Microsoft: Using the Windows Update Agent API
Microsoft: Windows Update log files
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