Digital Signature - Sign Button Not Working

I am also having this same issue. I tried everything suggested in this thread and I have not had any success. Unfortunately, while changing settings, uninstalling, reinstalling, using the adobe cleaning tool, deleting files, “fixing the installation”, and doing updates, I created another problem. The pdf attachment that I’m (still) trying to sign now shows up in the email I received with a Google Chrome icon on the file instead of the Adobe icon that it used to have. (The file still opens up in Adobe though, and I made sure that my Windows settings shows Adobe Acrobat at the default program for pdf). 

Please--I need help! I’ve been trying to fix the issue with the signature for four days now. 

I know these posts are fairly old, but I did find a fix for this problem that worked for me and didn't involve uninstalling anything.  Unfortunately I don't know exactly what did the trick, but I went to Edit > Preferences > Signatures > Creation & Appearance.  And took the following steps:

1.  Ensured the Default Signing Method was set to Adobe Default Security
2.  Signing Format set to CAdES-Equivalent
3.  Made sure all boxes were unselected.  Unselected "Include signature's revocation status"
4.  I changed "Enable Review of Document Warnings" to "Never"
5.  I changed "Prevent Signing Until Warnings Are Reveiwed" to "Never"
6.  I deselected "Use modern user interface for signing and Digital ID configuration.
7.  I then created a signature under "New" 

After I hit ok, the document immediately allowed me to sign.  I did not need to restart the program or my computer or re-install anything.  It took about 60 seconds to complete. 

I am also facing this issue on a fresh new installation of CC on a Windows 11 PC. I'll confirm if the highlighted answer fixes this for me, but wanted to make ditto the above and make Adobe aware there seems to be a problem here!

I had the same problem. and have tired all the listed below however i still have not yet able to sign the documents. 

please help! 

I have the same problem on Windows 10: I get to this step, I click on the blue "Sign" button, it seems to react (color slightly changes) but nothing happens afterwards. I tried both ways, in a signature field or by drawing a rectangle.

This is so frustrating, this functionality worked a few weeks ago and I signed a PDF document. Now I need to sign a very important financial document and I'm stuck...

Adobe, please help!

Hi Trent

Hope you are doing well and sorry for the trouble. As described you are unable to digitally sign the PDF.

Is this a behavior with a particular PDF file or with all the PDFs? Please try with a different PDF file and check.

As mentioned you have tried Saving the Document, Checking for Update, Uninstalling and Reinstalling Adobe, Creating a new Digital Signature but still the sign button is not working.

Please try to reset the Acrobat preferences to default as described in the help page https://community.adobe.com/t5/acrobat/how-to-reset-acrobat-preference-settings-to-default/td-p/4792082 and reboot the computer once and check if that helps.

If it still doesn't work, please create a new test user profile or enable the root account in Mac and try using the application there and check.

Regards

Amal