Adobe Acrobat Pro Sign In Button Not Working

Hi all,

I am having an issue with the 'Sign In' button on Adobe Acrobat Pro continuous release ver 2024.005.20421 on Windows 10. 

The text of the button changes from black to blue when I hover the mouse cursor over that area, but it does not respond when clicked. If I try to sign in via the help menu there is an 'initializing registration please retry after a minute' message. The same result is encountered on several workstations.

I suspect that the issue is related to blocked URLs as internet access is quite restricted in our environment. 

https://www.adobe.com/devnet-docs/acrobatetk/tools/AdminGuide/endpoints.html 

Referring to the above link. *.adobe.com and *.adobelogin.com are already allowed and I can login via web browser.  

Has anyone else encountered this issue?  Are there other URLs to be allowed for the Sign In function to work?

Thanks for your help.