What fixed the issue for me is this:

In aws console, go to EKS,and create access entry (of the type Standard) for the user - > first add AmazonEKSAdminViewPolicy and then test you are able to run basic view commands such as kubectl get svc. Then come back to console and in same access entry, edit to also add AmazonEKSClusterAdminPolicy. Sometimes, creation of access policies is hindered by errors if you try to add multiple policies at same time, so go sequentially.