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By default In web.xml of prweb.war an entry would be made for IAC Servlet name with IACAuthentication as Auth Service.
Hence you need to use IAC as the servlet name if you want to hit IACAuthentication service and its corresponding activity. You can enable debug logging on IACAuthentication activity to find out whether it is being called.
I've been working with Rohith on the configuration. The issue was on the Requestor Brower type, the PRPC:Unathenticated access group wasn't picking up the custom rule. Once referenced the proper access group it has worked.