PDF/A verification error

Hello,

We use a third party vendor to convert our pdf files into pdf/a compliant files.

The process works without any errors, but some files fails verification in adobe.

Can you please provide insight on what is missing and why verification fails?

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Legend

Please show a screenshot of the verification failure message, and say the exact version of Acrobat you are using (not "latest" please).

Participant

Adobe version : 2021.011.20039.

Participant

When I run analyze it says no problems found.

Participant

Apologies files not attached in the original post.

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