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WU_E_XML_MISSINGDATA
WU_E_XML_MISSINGDATA means that Windows Update Agent could not find required information in an update's XML metadata. The problem is about the metadata needed to evaluate or process an update.
What to check
- Record the update service, update identity, and the first related WindowsUpdateClient event.
- Do not edit update metadata by hand; refresh or reobtain it through the supported update service path.
- Compare this code with download or installation errors, which occur later in the update workflow.
Microsoft: Windows Update error reference
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