Postman not working on Ember with back-end JSON API

I am new to Ember and have posted a similar post regarding troubleshooting of a simple Ember front-end with JSON API web back-end (see below). My problem here is that I am unable to get Postman to display any data in the DevTools console - its blank. I can use Postman to submit requests and see the response in the body, that is all.

I have tried various permutations of using the application while going so far as to uninstall and re-install. But, nothing is working. Is anyone aware of the steps necessary to use Postman to troubleshoot problems?

Ember 3.2.2 not routing request to .NET Core 2.1 JSON web API