Studio and Copilot?

I'm testing some Studio survey's and working on the code to execute the call to the API. I'm using the following code... of course with valid phone numbers and SID... but I cannot figure out how to get it to work with Copilot.

I don't want to have to deal with figuring out the phone numbers to use and figured it would pick up the number via Copilot. I tried leaving the FROM phone number off, as a blank string, etc. and nothing works. I cannot find example of what is expected.

Anyone know how to fire off the ExecutionResource.Create() so that it will pick up the FROM phone number from Copilot? Or maybe if it will not? If not, do I need to just pick a phone number to use? Is ExecutionResource.Create() the correct why to fire off a Studio survey?

TwilioClient.Init(accountSid, authToken);

      var execution = ExecutionResource.Create(

        to: new Twilio.Types.PhoneNumber(""),

        from: new Twilio.Types.PhoneNumber(""),

        pathFlowSid: ""

      );