When keycloak fails to get the access_token from France Connect, we don't know the reason, only something like :
ERROR [org.keycloak.broker.oidc.AbstractOAuth2IdentityProvider] (default task-6) Failed to make identity provider oauth callback: org.keycloak.broker.provider.IdentityBrokerException: No access_token from server.
When keycloak fails to get the access_token from France Connect, we don't know the reason, only something like :