AATL Member not being recognized

New Here ,

This appears different than the other posts I have seen - when I open the file containing the digital signature for this client, I am getting the warning that "Signer's identity is unknown because it has not been included in your list of trusted certificates and none of its parent certificates are trusted certificates." When I click the signature properties, it says it has been issued by IGC CA 1 IdenTrust Global Common, which is shown as an active and approved member of the AATL. What is the issue?

TOPICS

Security digital signatures and esignatures