Some value from Postman test undefined

Question

I need to create tests in Postman for running key values for the AI Conversation app. I have created tests, where I have used the logic below, where I can see all of the values after a test run except actual_cpid For all values, I have used https://jsonpathfinder.com/

Postman doesn't show this value in the result. Could you please help me figure out what I have missed?

Here is my code for Postman:

let jsonData = pm.response.json();
let utterance = jsonData.utterance;
let actual_intent = jsonData.intent.name;
let expected_intent = pm.variables.get("intent");
let actual_grammar = jsonData.grammars.speech_grammar;
let actual_cpid = jsonData.dialog_metadata.outgoing_data.data.CALLPURPOSE_ID;
let actual_dnis = jsonData.dialog_metadata.destination_uri;

tests[" ," + utterance + ", " + 
            expected_intent + ", " + 
            actual_intent + ", " + 
            actual_grammar + ", " +
            actual_cpid + ", " +
            actual_dnis + ", " +
            pm.environment.get("dialog_id")
            ] = true;