Authentication using WebAPI backend

I have a single page application developed in Angular UI and works as expected in the Web browser. I am now converting this WebApplication to a Ionic / phone gap app. The problem that I am running into is when I am running ios sim using Xcode I do not see the facebook auth page.

link to my webapi: http://roadtripplus.azurewebsites.net
Git to Ionic App: https://github.com/madhavabhyankar/RoadTripOneAppV1

Please let me know what I am missing.

Thanks in advance.
~M