Hi Prasanth,

Below presence query will display the number of sessions based on user. You have to use this to list number sessions and display message to user.

Please pass your operator as below to "operatorsList.add(); API"

List<String> operatorsList = new ArrayList<>();
                                operatorsList.add("Admin.Cars");
                                operatorsList.add("Admin@demo");

PresenceQueryClause clause1 
  =PresenceQueryClause.Builder.createInClause('A',"Standard","operatorId", operatorsList,false);

List<com.pega.pegarules.pub.presence.PresenceQueryClause> clauseArray = new ArrayList<>();
clauseArray.add(clause1);

try{
  List<com.pega.pegarules.pub.presence.PresenceRecord> values  = tools.getPresenceService().queryPresence("(A)",clauseArray ,"Standard");
  oLog.infoForced("Testing "+values.size());
  System.out.println(values.size());
  for(com.pega.pegarules.pub.presence.PresenceRecord temp : values) {
      oLog.infoForced(temp.getOperatorId());
      oLog.infoForced(temp.getState());
      oLog.infoForced(temp.getGeoLocation());
      oLog.infoForced(temp.getLoggedInTime());
    oLog.infoForced(temp.getLoggedInTime());
    oLog.infoForced(temp.getStatus());
    oLog.infoForced(temp.getFullName());
    
    
  }
}catch(Exception e){
  System.out.println(e.getMessage());
}

You can also check below info about "Number of concurrent sessions allowed for each operator"

https://community.pega.com/sites/default/files/help_v73/procomhelpmain.htm

Thanks,

Naresh