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I have installed some valid certificates in keychain but it seems that acrobat can't access them or does not recognize them.
I am using MAC OS Catalina 10.15.2 with Adobe Acrobat Reader DC 2019.021.20058
Any hint on this would be appreciated.
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Please check that your digital ID is valid for the scope, meaning that it needs to have key usage and extended key usage in line with Acrobat's requirements. See https://www.adobe.com/devnet-docs/etk_deprecated/tools/DigSig/changes.html under 11.0.09. If the ID is not aligned with the KU/EKU requirements it would not show up in the list of Digital IDs.