Just here to reinforce the "I have the same question" button I pressed. Every other button and function works. Even all the other buttons on the final GUI along with "Sign." Just the critical button doesn't do anything, and I use this for work of a time sensitive nature that needs to be accomplished from home. Reinstalling failed to rectify the issue.
Sorry for the inconvenience caused to you.
Please update Reader to the latest version from Help>Check for Updates and let us know the version you are using from Help>About Acrobat Reader DC.
Also, please share a screenshot of what happens when you click on 'Sign'
Thank you for reporting the issue.
Please go to Certificates tool -> Digitally Sign -> Sign with Digital Id screen should show where you will see the list of available digital ids.
Please click on "View Details" link at the right side of the digital Id. This should open "Certificate Viewer" window.
Please send us screenshot od "Summary", "Details", "Revocation" , "Trust" tab.
This would provide us the certificate details and we will be able to analyze why the certificate is not being used for signing
<Redacted screenshots due to privacy concerns. Please PM for more information.>
Still waiting for a response. It has been 3 months.