Insert Digital Signature Field

Click on Tools - Prepare Form and then click on "More" at the right side of the window and then on "Revert to Acrobat Form". In the future, do not tick the box that says "This document requires signatures" when creating the form.

Hi Angelaf

We are sorry for the trouble. As described you are unable to add a digital signature field to a document.

++ Adding on to the discussion

Is this a behavior with a particular PDF file or with all the PDFs? Please try with a different PDF file and check. If its a file specific issue please share the file with us for testing.

Do you get any error message when you try to add the digital signature field to the document? If yes, please share the screenshot of the same for a better understanding.

Assuming that the file is free from any kind of restriction/password protection,  you may try the steps below and see if that works for you.

1. What is the version of the Adobe Acrobat DC you are using? To check the version go to Help > About Adobe Acrobat And make sure you have the latest version 20.12.20043 installed from the help menu > check for updates.

2. You may also try to repair the installation (Windows Only) from the help menu > repair installation and see if that makes any difference.

3. If it still doesn't work, please try to reset the preferences to default as described here https://community.adobe.com/t5/acrobat/how-to-reset-acrobat-preference-settings-to-default/td-p/4792082?page=1 and see if that helps.

4. For testing purposes: Try to turn off the protected mode (Windows Only) and see if that makes any difference. Go to Edit > Preferences > Enhanced Security > Uncheck 'Enable protected mode at startup', turn off the protected mode and uncheck the enhanced security > Click OK and reboot the application.
Note: Turning off the protected mode may possess security risks, Please turn on the security after testing.

Let us know how it goes

Regards

Amal

That is odd, unless the new document that you're referring to has been made read-only with, encrypted with password and editing restrictions,  signed,  or has a certified digital signature, for example.

In which Acrobat Pro is this happening: Standard or DC?

Have you tried repairing the installation?