Not able to clusterize keycloak deployed as Azure web app

[Nikolche-Veljanovski-fntext]

I tried using JDBC_PING protocol for keycloak clusterization. The setup works fine on local, but we have problems establishing the same on Azure
I am deploying 2 keycloak instances as Azure web apps using shared Azure flexible postgresql DB, latest quay image and provided cache-ispn-jdbc-ping.xml.
In jgroups ping table I am seeing
I can see that when the app service instances start, I only end up with a single record in the JGROUPSPING table. I can see that each node adds a record with the nodes IP address (private dns zone record in my case) which is then replaced by the next node that starts up.
That would mean that my 2 keycloak instances work as singleton (which I see in the logs) and actually are not clusterized.
Is this some limitation on communication between Azure App Services on port 7600 or something else?