List Collector variable not returning approver in flow designer

[SHALIKAS]

I have a list collector variable called application_name which refers to the service table. I want the managed_by person which is in the service table to be the approver. I am writing the below script but it is returning empty values
var approvers =[];

var service= fd_data._1__get_catalog_variables.application_name;

var gr=new GlideRecord('cmdb_ci_service');

if(gr.getValue(service))

{

var m=gr.getValue('managed_by');

approvers.push(m);

}

return "ApprovesAnyU[" +approvers.join(',') + "]";

This is returning correct approver if only 1 value is selected in the list collector variable but for more than one value it is returning empty approver.

I also tried using

Still returning empty values

[Mark Manders]

What is the value of your variable when you check the execution details? It looks like you are checking the cmdb_ci_service records based on 1 sys_id, while your variable is a list, not a single record.

[SHALIKAS]

while I select 1 value in the list collector variable then it is returning one value.

If I select more than one value in list collector variable it returns empty

[Mark Manders]

Does this help:

(function() {
    var approvers = [];
    var serviceNames = fd_data._1__get_catalog_variables.application_name; 

    // Iterate through each selected application in the list
    for (var i = 0; i < serviceNames.length; i++) {
        var serviceName = serviceNames[i];
        var gr = new GlideRecord('cmdb_ci_service');
        if (gr.get('name', serviceName)) { 
            var manager = gr.getValue('managed_by');
            if (manager) {
                approvers.push(manager);
            }
        }
    }
    return "ApprovesAnyU[" + approvers.join(',') + "]";
})();