Authorization window does not open when using AppClip

## Issue

I'm running the following method inside a hook:

`const authState = await authorize(config);`

When running in AppClip, the confirmation alert before opening the browser window shows up, but when clicking on "Continue", nothing happens.

When running the same code in a non-clip app, it does work.

Are there any reported issues related to AppClip?

I have debugged in the object-c code itself, and the line `openedUserAgent = [authenticationVC start];` (in the file OIDExternalAgentIOS.m) gets called, but eventually nothing happens.

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## Environment

* **Your Identity Provider**: `Keyclock`
* **Platform that you're experiencing the issue on**: `iOS`
* **Your `react-native` Version**: `e.g. 0.66.5`
* **Your `react-native-app-auth` Version**: `7.1.0`
* **Are you using Expo?**: `No`