I came across this:
https://issues.jboss.org/browse/KEYCLOAK-2037

Maybe it's the same issue here?

On 4 November 2015 at 16:35, Marko Strukelj <mstrukel@redhat.com> wrote:
On Wed, Nov 4, 2015 at 4:10 PM, Andrej P <ado.boj.83@gmail.com> wrote:


On Wed, Nov 4, 2015 at 3:48 PM, Marko Strukelj <mstrukel@redhat.com> wrote:
Can you confirm that you see the following lines in your host-controller.log:

[Server:authentication-server-demosetup] 15:58:23,220 INFO  [org.wildfly.extension.undertow] (ServerService Thread Pool -- 72) WFLYUT0021: Registered web context: /auth
[Server:authentication-server-demosetup] 15:58:23,267 INFO  [org.jboss.as.server] (ServerService Thread Pool -- 36) WFLYSRV0010: Deployed "keycloak-server.war" (runtime-name : "keycloak-server.war")
   No, this lines are missing in log.

That's the root of your problem then. Keycloak server subsystem doesn't seem to be initialized at all. 
From your config files it follows that your 'authentication-server-demosetup' server is using 'group-authentication' group, and 'group-authentication' group is using 'idbt-ha' profile, and 'idbt-ha' profile contains keycloak-server subsystem declaration ...

I see no reason for Keycloak server to not get initialized.

I'm sorry to say, but I'm out of ideas. If I were you I would try from scratch with an OOTB domain.xml, and host.xml, and setup up Keycloak server without any additional applications deployed, following the instructions I described previously - just get server-one, and server-two using the same group tied to full-ha profile. That way you should get Keycloak up and running. Then I would slowly evolve the configuration towards what you have now. Somewhere during that process there must be a step, that breaks things, and it's not obvious what that step is.



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