AWS Opensearch SAML Keycloak SSO

We are implementing SSO in our application where :

  • AWS Opensearch as SAML client in Keycloak.

When I visit, Kibana URL such as this- https://xxx-yyy.eu-west-1.es.amazonaws.com/_plugin/kibana/ it redirects me to keycloak login page. After successful login on keycloak, 500 error is displaying {“statusCode”:500,“error”:“Internal Server Error”,“message”:“Internal Error”}

Any suggestions/documentation would be helpful.

Thanks in Advance.