Flutter app quits when FirebaseAuth.instance.signInWithProvider() is called

[janae225]

I'm building a Flutter app that uses an OpenID Connect custom provider for user authentication. Everything has been setup according to the documentation and I've set up my the provider in Firebase (https://firebase.google.com/docs/auth/ios/openid-connect?hl=en&authuser=1). The app code in question is:

   try {   
      var provider = OAuthProvider('<OIDC ID listed in Firebase>');
      fetchedCredential = await FirebaseAuth.instance.signInWithProvider(provider);
    } catch (e) {
      print("Error with OIDC: " + e.toString());
    }

Every time fetchedCredential = await FirebaseAuth.instance.signInWithProvider(provider) is called, the app quits and does not show an error message. This happens when it's run normally and in debug mode. Debug mode shows that it's quitting specifically when the signInWithProvider(provider) method is called. Does Flutter truly work with third-party identity providers? And is there better documentation on how to do this, the steps in Google's documentation (https://firebase.google.com/docs/auth/ios/openid-connect?hl=en&authuser=1) are leading me nowhere.

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FLUTTER DOCTOR OUTPUT:
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.10.5, on macOS 13.4.1 22F770820d darwin-x64, locale en-US)
[✓] Android toolchain - develop for Android devices (Android SDK version 32.1.0-rc1)
[✓] Xcode - develop for iOS and macOS (Xcode 14.2)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2022.2)
[✓] VS Code (version 1.65.2)
[✓] Connected device (3 available)
[✓] Network resources

• No issues found!

Dependency versions used:

cloud_firestore: ^4.8.1
cloud_functions: ^4.3.3
cupertino_icons: ^1.0.5
dartz: ^0.10.0
firebase_auth: ^4.7.2
firebase_core: ^2.14.0
firebase_database: ^10.2.3
firebase_messaging: ^14.6.3
flutter_linkify: ^6.0.0
flutter_local_notifications: ^14.1.1
flutter_modular: ^5.0.3
flutter_svg: ^2.0.7
getwidget: ^3.1.1
oauth2_client: ^3.2.1
package_info_plus: ^4.0.2
platform: ^3.1.0
provider: ^6.0.2
shared_preferences: ^2.0.12
intl: ^0.18.1