can anyone help me with this problem please?

Warning  FailedBuildModel  7m11s  ingress  Failed build model due to AccessDenied: User: arn:aws:sts::256032450122:assumed-role/primary-eks-eks-cluster-instanceRole-role-4a78aea/i-0f132b11c4bc816c1 is not authorized to perform: elasticloadbalancing:DescribeLoadBalancers because no identity-based policy allows the elasticloadbalancing:DescribeLoadBalancers action

I don't see where you're attaching the policy to the cluster itself.

Thank you for your response. I have managed to resolve this problem. It was a typo in the helm chart's value

serviceaccount

which should be

serviceAccount

and the namespace in the iam role and service account were different.

Ouch. That sounds like no fun.

Indeed. it was a nightmare