Keycloak as an Identity Broker & an Identity Provider - docker

Question

I am trying to connect 2 Keycloak instances. One as an Identity Provider and one as an external broker by following this article.
I am running 2 docker instances for keycloak with the following setup:
Keycloak-External (127.0.0.1:9090)
Keycloak Internal (127.0.0.1:8080)
Created 2 realms:
realm:“keycloak-external-broker” in Keycloak External (127.0.0.1:9090)
realm “keycloak-internal-identity” in Keycloak Internal (127.0.0.1:8080)
Registered Identity Provider on external broker with following setup
Configured Broker as Client on internal identity provider
Created a demo user from the user's section in Keycloak Internal (127.0.0.1:8080)
Accessed External Login url and click on sigin
http://127.0.0.1:9090/realms/keycloak-external-broker/account/
Following page shows up:
Clicking Employee login redirects me to internal identity provider as
But when i try to login with user created in internal keycloak.it gives me following error.
I'm putting out logs as well. I tried troubleshooting with various options as suggested in various blogs but still facing the issue. Appreciate any leads, Is there anything that i'm missing?
2023-02-15 09:11:40,900 WARN [org.keycloak.events] (executor-thread-179) type=IDENTITY_PROVIDER_LOGIN_ERROR, realmId=bf5ad1d9-c4c9-4f20-8272-e415c04ec67c, clientId=account-console, userId=null, ipAddress=172.17.0.1, error=identity_provider_login_failure, code_id=970a50e2-50af-4f38-80e1-8d4dd900c825, authSessionParentId=970a50e2-50af-4f38-80e1-8d4dd900c825, authSessionTabId=SPngHd5ApfM
2023-02-15 10:05:28,991 ERROR [org.keycloak.broker.oidc.AbstractOAuth2IdentityProvider] (executor-thread-190) Failed to make identity provider oauth callback: org.keycloak.broker.provider.IdentityBrokerException: No access_token from server. error='Realm does not exist', error_description='null', error_uri='null'
at org.keycloak.broker.oidc.OIDCIdentityProvider.verifyAccessToken(OIDCIdentityProvider.java:574)
at org.keycloak.broker.oidc.OIDCIdentityProvider.getFederatedIdentity(OIDCIdentityProvider.java:384)
at org.keycloak.broker.oidc.AbstractOAuth2IdentityProvider$Endpoint.authResponse(AbstractOAuth2IdentityProvider.java:502)
at jdk.internal.reflect.GeneratedMethodAccessor669.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:170)
at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:130)
at org.jboss.resteasy.core.ResourceMethodInvoker.internalInvokeOnTarget(ResourceMethodInvoker.java:660)
at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTargetAfterFilter(ResourceMethodInvoker.java:524)
at org.jboss.resteasy.core.ResourceMethodInvoker.lambda$invokeOnTarget$2(ResourceMethodInvoker.java:474)
at org.jboss.resteasy.core.interception.jaxrs.PreMatchContainerRequestContext.filter(PreMatchContainerRequestContext.java:364)
at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:476)
at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:434)
at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:192)
at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:152)
at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:183)
at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:141)
at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:32)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:492)
at org.jboss.resteasy.core.SynchronousDispatcher.lambda$invoke$4(SynchronousDispatcher.java:261)
at org.jboss.resteasy.core.SynchronousDispatcher.lambda$preprocess$0(SynchronousDispatcher.java:161)
at org.jboss.resteasy.core.interception.jaxrs.PreMatchContainerRequestContext.filter(PreMatchContainerRequestContext.java:364)
at org.jboss.resteasy.core.SynchronousDispatcher.preprocess(SynchronousDispatcher.java:164)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:247)
at io.quarkus.resteasy.runtime.standalone.RequestDispatcher.service(RequestDispatcher.java:73)
at io.quarkus.resteasy.runtime.standalone.VertxRequestHandler.dispatch(VertxRequestHandler.java:151)
at io.quarkus.resteasy.runtime.standalone.VertxRequestHandler.handle(VertxRequestHandler.java:82)
at io.quarkus.resteasy.runtime.standalone.VertxRequestHandler.handle(VertxRequestHandler.java:42)
at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1284)
at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:173)
at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:140)
at io.quarkus.vertx.http.runtime.StaticResourcesRecorder$2.handle(StaticResourcesRecorder.java:84)
at io.quarkus.vertx.http.runtime.StaticResourcesRecorder$2.handle(StaticResourcesRecorder.java:71)
at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1284)
at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:173)
at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:140)
at io.quarkus.vertx.http.runtime.VertxHttpRecorder$6.handle(VertxHttpRecorder.java:430)
at io.quarkus.vertx.http.runtime.VertxHttpRecorder$6.handle(VertxHttpRecorder.java:408)
at io.vertx.ext.web.impl.RouteState.handleContext(RouteState.java:1284)
at io.vertx.ext.web.impl.RoutingContextImplBase.iterateNext(RoutingContextImplBase.java:173)
at io.vertx.ext.web.impl.RoutingContextImpl.next(RoutingContextImpl.java:140)
at org.keycloak.quarkus.runtime.integration.web.QuarkusRequestFilter.lambda$createBlockingHandler$0(QuarkusRequestFilter.java:82)
at io.quarkus.vertx.core.runtime.VertxCoreRecorder$14.runWith(VertxCoreRecorder.java:576)
at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2449)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1478)
at org.jboss.threads.DelegatingRunnable.run(DelegatingRunnable.java:29)
at org.jboss.threads.ThreadLocalResettingRunnable.run(ThreadLocalResettingRunnable.java:29)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:829)
2023-02-15 10:05:29,004 WARN [org.keycloak.events] (executor-thread-190) type=IDENTITY_PROVIDER_LOGIN_ERROR, realmId=bf5ad1d9-c4c9-4f20-8272-e415c04ec67c, clientId=account-console, userId=null, ipAddress=172.17.0.1, error=identity_provider_login_failure, code_id=9ab52933-adf7-4987-97af-320797a534cb, authSessionParentId=9ab52933-adf7-4987-97af-320797a534cb, authSessionTabId=o8n1TLDNldc