Adobe Reader or Acrobat displays a At least one signature has problems message when signed PDF is opened - Foxit PDF SDK

Adding the certificate that was used to apply the digital signature into Adobe's list of Trusted Identities by some easy steps.

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At least one signature has problems Error in Adobe Reader

How do I Resolve the At least one signature has problems error in Adobe Reader? – Addo Sign Support

Adobe Acrobat Standard (2024) review

At least one signature has problems Error in Adobe Reader