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WU_E_CALLBACK_COOKIE_NOT_FOUND
WU_E_CALLBACK_COOKIE_NOT_FOUND means a caller tried to use a callback cookie that Windows Update no longer recognizes. This is primarily an API-lifecycle error for code using asynchronous WUA operations.
What to check
- Keep the callback, operation, and session objects alive until the matching
End*method completes. - Do not reuse cookies after cancelling, disconnecting, or completing the associated operation.
- Log the operation start, callback registration, completion, and cleanup order to find the first lifecycle mismatch.
Microsoft: Windows Update Agent API reference
Microsoft: IUpdateInstaller interface
Microsoft: Windows Update error reference
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