Missing permissions to get logs
Make sure you have the required role to get application logs in this namespace. Ask your administrator to grant you this role 
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: view-application-logs
  namespace: <project-name>
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-logging-application-view
subjects:
- kind: User
  name: <testuser>
  apiGroup: rbac.authorization.k8s.io