I’ve a config map which I need to read from K8S via api

I Created a cluster role

kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: zrole
rules:
- apiGroups: [""]
  resources: ["configmaps"]
  verbs: ["get", "list"]

and cluster role binding

kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: z-role-binding
subjects:
- kind: Group
  name: system:serviceaccounts
  apiGroup: rbac.authorization.k8s.io
roleRef:
  kind: ClusterRole
  name: zrole

Config Map

apiVersion: v1
kind: ConfigMap
metadata:
  name: z-config
  namespace: fdrs
data:
  avr: client1
  fuss: xurbz

The code is used like

clientSet.CoreV1().ConfigMaps(uNamespcae)

when I run the code locally (and provide to the the GO api the kubeconfig) I was able to get the config map data, However when I run the code inside the cluster I got error: invalid token , any idea what am I missing here?