InfoPath Dev

I'm trying to insert two digital signatures into a SharePoint/InfoPath web browser form. In reading various articles, I should see in Form Option under category, Digital Signatures, but I don't have that option. I have searched and I cannot find anything on what needs to be enabled to see that category. I have used digital signatures in a Word Document fine but I just learned today that you can insert multiple signatures in section controls in a SharePoint/InfoPath list form. Thanks in advance for help.

I had thought perhaps they weren't browser compatible - but this indicates otherwise: https://support.office.com/en-us/article/web-browser-compatibility-in-infopath-forms-services-0356450c-82ec-40a5-b145-c7e935f73fdc - I added a sig control in a filler form, changed to browser compat and have an error saying the control isn't compatible, so I'm guessing that compatibility chart is out of date and they aren't supported.