How to check access on my Kubernetes Namespace on EKS

Recently I provisioned my Kubernetes cluster, however I found I cannot create deployments in my namespace, something must go wrong here:

> kubectl auth can-i create deployments --namespace mynamespace

However, there is no clear guidance in Kubernetes documents on how to investigate. Here are the steps I did to figure out:

Step 1 Describe your namespace

>kubectl describe namespace mynamespace
Name: mynamespace