The RBAC check we have is whether the user can list namespaces. The correct check is whether the user can *get* namespaces.
Created attachment 1669191 [details] POST get namespace request on Overview page
Home -> Overview page now POST a request to get namespace by api/kubernetes/apis/authorization.k8s.io/v1/selfsubjectaccessreviews and reture 201 without issue. Now this could be Verified. Checked on 4.5.0-0.ci-2020-03-10-225406
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2020:2409