FAQ

Adobe Acrobat shows this error when S/MIME certificate has been used to digitally sign a PDF document.  Adobe and Sectigo are offering a new product, specifically targeted for document signing.  Citation from Sectigo Support: 

Hello,

Greetings from Sectigo Support!

Yes, the Personal Authentication Certificate which you've purchased will give a trusted identity error when you sign Adobe PDF files. Instead, it is recommended to purchase a new certificate specifically designed for document signing which comes with a new trusted chain " Sectigo RSA Document Signing CA” added into Adobe Approved Trust List (AATL).

Please do refer the following link for more details about Sectigo document signing certificate.

https://sectigo.com/ssl-certificates/document-signing-certificates

Please let us know if you need any further support.

Regards,
Sectigo - Technical Support

 

Source: https://community.adobe.com/t5/acrobat/can-t-sign-documents-sectigo-signature-does-not-get-validated-quot-invalid-policy-constraint-quot/td-p/10609603

Solution: kindly obtain a Sectigo Document Signing certificate (InterSSL is currently not offering this product).