Problem running AWS Rancher Manager and RKE2 - Free Trial

I have tried launching the free trial of your AWS Gov Marketplace offering:

While I manage to have the cluster running successfully (all 6 EC2 instances and 2 ELBs), I cannot actually connect to Rancher UI and access the cluster.

Accessing the Rancher Load Balancer DNS gets me to 404 NginX error page, but if I try to use any of the open ports in ELB SG (80, 443) with it, I cannot reach that endpoint.

Is there maybe some more detailed documentation/tutorial that could guide me in accessing the Rancher Manager and the RKE2 cluster once I create it via AWS offering (and also to check if my configuration process was done correctly)?

Thank you in advance for any suggestions.