Developer's guide still refer to legacy security for EJB invocations from a remote server instance

I am trying to migrate configuration for two WildFly instances for EJB remoting since using elytron is now mandatory but the documentation still refer to legacy security system:

https://docs.wildfly.org/25/Developer_Guide.html#configuring-the-client-server-to-point-to-the-ejb-remoting-connector-on-the-destination-server

<management>
        <security-realms>
            ...
            <security-realm name="ejb-security-realm">
                <server-identities>
                    <secret value="dGVzdA=="/>
                </server-identities>
            </security-realm>
        </security-realms>

Remote EJB calls work perfectly from a java SE client but I cannot get calls to work from one server to another.