ios app crashing on Authorise

## Issue

The app crashes on authorise with the following error log:

`Jan 11 10:45:49 Andrews-Air com.apple.CoreSimulator.SimDevice.9C7C7AD2-A83D-4558-BBC5-C797E719DEB4[28153] (UIKitApplication:[c0e8][rb-legacy][29095]): Service exited due to SIGABRT
`

This is happening when I add my own Azure B2C configs and happens on both the example app and my own app that implements this package.

## Environment

* **Your Identity Provider**: `e.g.Azure B2C`
* **Platform that you're experiencing the issue on**: `tested on iOS, probably both`
* **Are you using Expo?** No