VMC Certificate Chain Signature Verification Failed

What Does “VMC Certificate Chain Signature Verification Failed” Mean?

“VMC certificate chain signature verification failed” means at least one certificate signature does not verify against the next issuer in the intended VMC path. The VMC draft requires signature and path validation to a trusted BIMI root using RFC 5280. Fetch and Validation of Verified Mark Certificates draft 11 documents the controlling requirement or boundary.

VMC path validation fails. A merely missing issuer is normally an incomplete-chain failure unless the checker explicitly maps it to this signature output.

Why Does VMC Certificate Chain Signature Verification Failed Appear?

VMC certificate chain signature verification failed appears when a child certificate's signature cannot be verified with the candidate issuer, commonly because the wrong issuer was paired or signed certificate data was altered. The exact diagnostic should be read at the scope of VMC certificate issuance chain rather than as proof that every BIMI layer failed.

How Do You Fix VMC Certificate Chain Signature Verification Failed?

To fix VMC certificate chain signature verification failed, replace the bundle with the exact leaf and issuer certificates supplied for the same issuance chain.

Correct signatures do not establish that the terminal root is trusted for BIMI.

What Should You Verify After Fixing VMC Certificate Chain Signature Verification Failed?

After fixing VMC certificate chain signature verification failed, verify every child signature with its issuer and then run full RFC 5280 path validation. Verification should use the exact public selector, URL, record, or file evaluated by the receiver.

The correction clears only this condition; it does not guarantee that a receiver will display an indicator.

Key Takeaways

• The affected object is VMC certificate issuance chain.
• The direct correction is to replace the bundle with the exact leaf and issuer certificates supplied for the same issuance chain.
• Correct signatures do not establish that the terminal root is trusted for BIMI.