Adobe Acrobat Reader DC (x64) (24.003.20180) Issue --Request e-signatures button disappears

Hello Everyone, 

I have a user with a "Request e-signatures" button that had disappeared. They once had this button listed under "All tools" when they were working on a document within their installation of the desktop application. This user is on a Windows 10 (not the Home edition) for desktops. 

I am currently troubleshooting the ways to make this button reappear within the application, but so far I haven't had much luck other than to reinstall the application without updating it. On the other hand, if I don't update Acrobat Pro, the user will be missing out on other premium features. 

Troubleshooting steps (not in any particular order):

1). I tried adding the registry key "bUpdater" as a DWord value set to "1" at HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Adobe\Adobe Acrobat\DC\FeatureLockDown\cServices.

2). Looking at the "Fill and Sign" tool to see if the "Request e-signatures" button was available. I found that sometimes it is, and othertimes it isn't, but when the button is available it is greyed out. When clicking on it, the wizard to add e-mails and customize the message doesn't appear. 

I had found a couple of alternative solutions that would work for the user like uploading the document online to use the web-base Adobe Sign utility, and using the "Prepare a Form" tool to had a e-signature field, but many of our users relay on using e-mail clients that having this feature restored somehow would be nice than to say rather than "here is what we are able to do for you". Since this tool once worked, and if  the Request e-signature button under "All tools" has nothing to do with the feature going away, some suggestions would be great.