SendToDesktop activity is throwing UnsupportedOperationException while publishing any of the CTI events to Desktop.

CTI used to work fine, but when we restructured the DEV and QA nodes it started throwing the below error.

We truncated the System-Status-Nodes table to regenerate, but it didn't help.

It is behaving same for individual nodes as well as load balancer url.

[MSG][Exception][STACK][java.lang.UnsupportedOperationException at com.pega.pegarules.cluster.internal.PRClusterDistributedObjectManagerImpl.getDistributedMap(PRClusterDistributedObjectManagerImpl.java:43) at com.pega.pegarules.exec.internal.async.ClusterSubscriptionsManager.getSubscriberNodesMap(ClusterSubscriptionsManager.java:86) at com.pega.pegarules.exec.internal.async.ClusterSubscriptionsManager.getAllSubscribedNodesSet(ClusterSubscriptionsManager.java:107) at com.pega.pegarules.exec.internal.async.PRHazelcastPublishServiceImpl.publish(PRHazelcastPublishServiceImpl.java:77) at com.pega.pegarules.exec.internal.async.ASMClusterCommunicator.publishEvent(ASMClusterCommunicator.java:70) at com.pega.pegarules.exec.internal.async.AsyncServicesManager.publishEvent(AsyncServicesManager.java:870) at com.pega.pegarules.exec.internal.async.PushNotificationsUtilsImpl.publishEvent(PushNotificationsUtilsImpl.java:47) at com.pegarules.generated.activity.ra_action_sendtodesktop_6c161375c7a33ffb33166cf4d2b79b96.step3_circum0(ra_action_sendtodesktop_6c161375c7a33ffb33166cf4d2b79b96.java:393) at com.pegarules.generated.activity.ra_action_sendtodesktop_6c161375c7a33ffb33166cf4d2b79b96.perform(ra_action_sendtodesktop_6c161375c7a33ffb33166cf4d2b79b96.java:103) at com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:3505) at com.pega.pegarules.session.internal.mgmt.Executable.invokeActivity(Executable.java:10563) at com.pegarules.generated.activity.ra_action_sendagentstateevent_0d7560ad5c4be11b2e6e90be15816842.step6_circum0(ra_action_sendagentstateevent_0d7560ad5c4be11b2e6e90be15816842.java:357) at com.pegarules.generated.activity.ra_action_sendagentstateevent_0d7560ad5c4be11b2e6e90be15816842.perform(ra_action_sendagentstateevent_0d7560ad5c4be11b2e6e90be15816842.java:133) at com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:3505) at com.pega.pegarules.session.internal.mgmt.Executable.invokeActivity(Executable.java:10563) at com.pegarules.generated.activity.ra_action_agentstatechanged_74d3659057cee1920c750fe0131bdf68.step4_circum0(ra_action_agentstatechanged_74d3659057cee1920c750fe0131bdf68.java:400) at com.pegarules.generated.activity.ra_action_agentstatechanged_74d3659057cee1920c750fe0131bdf68.perform(ra_action_agentstatechanged_74d3659057cee1920c750fe0131bdf68.java:120) at com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:3505) at com.pega.pegarules.session.internal.mgmt.Executable.invokeActivity(Executable.java:10563) at com.pegarules.generated.activity.ra_action_agentstatechanged_6af7c774c3978c89994970d7480d705d.step14_circum0(ra_action_agentstatechanged_6af7c774c3978c89994970d7480d705d.java:825) at com.pegarules.generated.activity.ra_action_agentstatechanged_6af7c774c3978c89994970d7480d705d.perform(ra_action_agentstatechanged_6af7c774c3978c89994970d7480d705d.java:222) at com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:3505) at com.pega.pegarules.session.internal.mgmt.base.ThreadRunner.runActivitiesAlt(ThreadRunner.java:646) at com.pega.pegarules.session.internal.mgmt.PRThreadImpl.runActivitiesAlt(PRThreadImpl.java:461) at com.pega.pegarules.integration.engine.internal.services.ServiceAPI.runActivities(ServiceAPI.java:1882) at com.pega.pegarules.session.external.engineinterface.service.EngineAPI.processRequestInner(EngineAPI.java:385) at sun.reflect.GeneratedMethodAccessor124.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at com.pega.pegarules.session.internal.PRSessionProviderImpl.performTargetActionWithLock(PRSessionProviderImpl.java:1270) at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:1008) at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:841) at com.pega.pegarules.session.external.engineinterface.service.EngineAPI.processRequest(EngineAPI.java:331) at com.pega.pegarules.integration.engine.internal.services.jsr94.PRServiceSession.executeRule(PRServiceSession.java:342) at com.pega.pegarules.integration.engine.internal.services.ServiceSessionImpl.executeRules(ServiceSessionImpl.java:198) at com.pega.pegarules.integration.engine.internal.services.ServiceJClientImpl.invoke(ServiceJClientImpl.java:129) at sun.reflect.GeneratedMethodAccessor224.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:370) at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:411) at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:223) at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingException(AppServerBridgeToPega.java:245) at com.pega.pegarules.pub.services.ServiceJClientStub.invoke(ServiceJClientStub.java:93) at com.pega.pegarules.services.client.PRServiceJClient.invoke(PRServiceJClient.java:60) at com.pega.pegacti.connection.RuleServiceJava.invoke(RuleServiceJava.java:134) at com.pega.pegacti.connection.RuleServiceJava.invoke(RuleServiceJava.java:119) at com.pega.pegacti.core.event.DispatchThread.run(DispatchThread.java:111) at java.lang.Thread.run(Thread.java:745) ]

Version being used: