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WU_E_METADATA_TIMESTAMP_TOKEN_CERTCHAIN
WU_E_METADATA_TIMESTAMP_TOKEN_CERTCHAIN means Windows Update could not verify a certificate in the chain used by the timestamp token. The token may be correctly formatted but still unusable because trust cannot be established.
What to verify
- Identify the missing, expired, revoked, or untrusted certificate by checking the preceding certificate-validation details.
- For enterprise catalogs, ensure the client has the intended certificate chain in the appropriate stores.
- Do not install broad or unrelated root certificates just to suppress the failure.
Microsoft: Certificates and security for Updates Publisher
Microsoft: Authenticode digital signatures
Microsoft: Windows Update error reference
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