Unable to add E-Signature to any PDFs.

Hello team, we are trying to add E-Signature to PDF files but for some reason the plus options never showed up. It always has a spinning circle and never works out. We have a workaround below from someone but it never works on one of the laptops. Any suggestions would be much appreciated.

Workaround:

deleted those three files from this location C:\Users\<username>\AppData\Roaming\Adobe\Acrobat\DC\Security and remove these three files.

1) acrobat_fss_signature_initials

2) acrobat_fss_signature_initialsi

3) acrobat_fss_signature_initialsk

Then uncheck Save signature box when you add signature. 

Thank you!