Hi everyone. Am trying to access kratos get identities endpoint. I get the following error I am using oathkeeper with hydra. When I change the authenticator from oauth2_introspection to noop it works. What am I missing?

Post <https://hydraenpoint/.ory/hydra/private/oauth2/introspect>": oauth2: cannot fetch token: 401 Unauthorized
Response: {"error":"invalid_client","error_description":"Client authentication failed (e.g., unknown client, no client authentication included, or unsupported authentication method)."