When you open Istio Service or Istio Workload dashboards in Grafana, they are not loaded correctly and this error shows up:

The browser console contains the following error

runRequest.catchError {"message":"\"Forbidden\"","status":403,"statusText":"Forbidden"}  

and a request (in browser network monitor) on grafana api /api/datasources/1/resources/api/v1/query shows OCP login page as a response ( see image )

Prometheus pod contains the following error: ( mkralik is a user in htpasswd idp )

2024/04/08 13:28:38 oauthproxy.go:790: basicauth: 10.131.0.112:48962 mkralik not in HtpasswdFile

I have also tried with Kubeadmin, the same error:

2024/04/08 13:31:16 oauthproxy.go:790: basicauth: 10.131.0.112:56654 kube not in HtpasswdFile