External Authorization with OPA is not working

Security
1

I have following below istio docs to integrate OPA with istio

This was one of the demo during [#IstioCon2021]

But i am getting exception, unable to use httpbin as workload with CUSTOM action

2022-09-07T13:00:14.576423Z	debug	envoy rbac	enforced denied, matched policy *default-deny-all-due-to-bad-CUSTOM-action*
[2022-09-07T13:00:14.576Z] "GET /post HTTP/1.1" 403 - rbac_access_denied_matched_policy[default-deny-all-due-to-bad-CUSTOM-action]

Below is my auth policy:
apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
name: httpbin-opa
spec:
selector:
matchLabels:
app: httpbin
action: CUSTOM
provider:
name: “opa.default”
rules:

  • { }