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WU_E_METADATA_CERT_MISSING
WU_E_METADATA_CERT_MISSING means Windows Update expected a certificate needed to validate metadata, but it was not present in the data supplied by the update source or available through the expected trust path.
What to verify
- Identify whether the missing certificate belongs to a Microsoft source, WSUS, a third-party catalog, or an offline scan package.
- For enterprise publishing, verify server-side certificate configuration and client deployment to Trusted Publishers and, when applicable, Trusted Root Certification Authorities.
- Use the exact certificate chain from the failing update source; do not substitute unrelated certificates.
Microsoft: Certificates and security for Updates Publisher
Microsoft: Windows Update security
Microsoft: Windows Update error reference
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