Getting “Elastic did not load properly. Check the server output for more information.” when accessing through gatekeeper

Question

I\'m using a Gatekeeper (quay.io/keycloak/keycloak-gatekeeper:10.0.0) for SSO with keycloak (docker.io/jboss/keycloak:11.0.2) on Kibana (docker.elastic.co/kibana/kibana-oss: