macOSCatalina, digital signature "Sign icon unresponsive."

[Mortezart]

Recently, on multiple Mac, with macOS 10.15.7 Catalina:

in Adobe Reader DC Pro 2021, once a digital signature is signed, the  blue Sign icon is unresponsive.

The following changes has been made to no avail.

The Default Signing Format changed from PKCS#7-Detached to CAdES-Equivalent and Enabled CryptoTokenKit framework support.

[Ria Tagra]

Hi @Mortezart 

Hope you are doing well.

Thank you for reaching out to us. Could you please confirm if you are still facing the issue?
Would you mind sharing the version of the Acrobat Reader DC you are using? To check the version go to Help > About Acrobat and make sure you have the latest version 21.07.20095 (Win) , 21.07.20096 (Mac) installed. Go to Help > Check for updates.

Also try to logout of the application, reboot the computer once and relogin with the same Adobe ID and see if that works for you.

We will be waiting for your response. Once we've got that information from you, we can take a closer look.

Regards
Ria