I believe the apiVersion needs to be updated in the rbac example above to: /v1 (not v1beta1)
as seen in the Kubernetes docs example here: https://kubernetes.io/docs/reference/access-authn-authz/rbac/#restrictions-on-role-binding-creation-or-update
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@mwdarab -- Mohammad, thank you for your feedback. I am looking into this article.
@MikeRayMSFT -- Mike, please review private PR 14810.