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AWS Managed AD ADFS user sign-on URL is not accessible outside of ADFS server.

We have setup a test ADFS on a Windows Server 2019 EC2 in our AWS Managed Active Directory. We have enabled the ADFS sign-on page (example URL: ADFS is successful for signing in with our AD credentials, and for accessing our AWS Console when tested from our ADFS server. The issue is that this URL is only opening when directly logged into the ADFS Windows Server. This sign-on URL is not available from another Windows 2019 EC2 test server that is within the same VPC and subnet. All Security Group ports, and Windows Firewalls are temporarily off on both EC2s. The servers can ping each other and using Nmap it displays all the open ports on the ADFS server. Route 53 has a hosted zone for this AWS Managed domain name, and both the ADFS server and test Windows 2019 server have DNS entries for them. We need to test accessing the ADFS sign-on from outside of the ADFS server. Is there another ADFS URL that is for this purpose or another ADFS configuration that is missing? Both links below were used for setting up ADFS on AWS Managed AD Thank you.
asked 5 months ago