Hello, I am trying to configure Automatic Login for my organization to access Organization shared gis data and web services, but I am still getting the following prompt when they attempt to access the provided URL..

So far I have configured the following:
- Portal set to allow access to portal through HTTPS only
- Do not allow anonymous access to portal
- Portal Admin connected to Active Directory
- IIS on Portal's webadaptor set to:
- Anonymous Authentication = Disabled
- Windows Authentication = Enabled
- Internet Options are set to Automatic Login only in Intranet zone
I was following Use Integrated Windows Authentication With Your Portal
Any advice on what to check next?