Unable to connect to primary with Kubernetes Service ag1-primary on AWS EKS

I have successfully followed this guide to create am HA SQL cluster on Kubernetes.

The guide uses AKS but states that any Kubernetes cluster can be used. I am using EKS. Specifically, I used this Terraform module to provision an EKS cluster in a VPC in a private subnet.

I am using internal ELBs for the LoadBalancer. I can successfully connect to each intance, but am unable to connect to SQL using the primary-ag1 k8s service.

I get the following error:

One thing i noticed in the service is the selector points to a Microsoft API:

selector: {role.ag.mssql.microsoft.com/ag1: primary, type: sqlservr}

Could this be the issue as I'm not running in AKS?

Start by comparing the ag1-primary Kubernetes Service in the issue with the Microsoft SQL Server HA guide and inspect its selector and endpoints on EKS. Verify whether the primary service resolves to the intended SQL instance and whether the internal LoadBalancer behaves as expected. Done means identifying the EKS-specific cause and documenting or correcting the configuration needed to connect to the primary.