In order to enable autofill for AMS360 Vertafore we are currently using a workaround provided by Keeper.
Create new -> Record
Select Record Type -> AMS360 Vertafore
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Give your record a title, then enter your username in the 'identifierinput' field and your password in the password field.
Also paste the website URL into the URL section.
Make sure you delete any other records tied to that web page.
Select 'Use Another Account' if it shows the existing email on the login screen.