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WU_E_UH_CALLED_BACK_FAILURE
WU_E_UH_CALLED_BACK_FAILURE means a callback-based installer reported failure back to the Windows Update Agent. The top-level code is only the wrapper; the root cause is usually an earlier error returned by the installer itself.
What to verify
- Search the log for the inner error code that appeared before the callback failure.
- Determine which installer technology was used and check its companion logs if available.
- Focus on the first failing component rather than on the final callback HRESULT alone.
Microsoft: Windows Update log files
Microsoft: Windows Update issues troubleshooting
Microsoft: Windows Update error reference
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