Fill & sign options are greyed out

Hi there

Hope you are doing well and sorry for the delayed response.

What is the version of the Acrobat DC you are using? To check the version go to Help > About Acrobat and make sure you have the recent version 23.08.20470 installed. Go to Help > Check for updates and reboot the computer once.
 
Also try to repair the installation from the help menu (Win Only) and see if that works.
 
Please try to reset the Acrobat preferences as described here https://adobe.ly/49t5oDz
 
If it still doesn't work, please remove the application using the Acrobat cleaner tool https://adobe.ly/3HUrZg5, reboot the computer and reinstall the application using the direct link https://adobe.ly/48gsThD;

Let us know how it goes

~Amal