Cisco Secure Mail (formerly CRES)

Apologies if this has been answered already...

We receive emails from multiple organizations utilizing Cisco Secure Mail. The system sends an HTML attachment which opens a local webpage - something like the below.

Somehow through Cisco black magic, the password is tied to the recipient email address. 

Our issue is that we are receiving these types of emails to multiple email accounts from multiple organizations. Is there a way to leverage 1Password to fill this local "webpage"?  The only way I have thought of is creating multiple copies of the same password saved with the login name/title including the recipient email address and the originating org name. (Which defeats the purpose of using 1Password). I see the SSO option but have no idea if this would work. 

the number of originating organizations is around 7-10. Number of emails addresses is about 3-5

file:///C:/Users/USERNAMEHERE/AppData/Local/Microsoft/Windows/INetCache/Content.Outlook/R4B61HUE/securedoc_20251112T155418.html