🐛 [Messaging] FCM token does not refresh after deleting token via deleteToken() on iOS

[helenaford]

Bug report

Describe the bug
Prior to installations, deleteToken on iOS is used to refresh the token. Since the update, no longer invalidates the token.

Also please see the related issue for RNFB invertase/react-native-firebase#5570

I believe you have to delete the installations id first which then makes subsequent calls of deleteToken generate a new one

Steps to reproduce the behavior:

1. call await FirebaseMessaging.instance.deleteToken();
2. call await FirebaseMessaging.instance.getToken();
3. See that the token has not changed

Expected behavior

A new FCM token should be generated, and the old one should be invalidated

Sample project

The current messaging example app on master branch, with the following button added:

      ElevatedButton(
          onPressed: () async {
            print('Example: Getting FCM before');
            String before = await FirebaseMessaging.instance.getToken();
            await FirebaseMessaging.instance.deleteToken();
            String after = await FirebaseMessaging.instance.getToken();
            print('CHANGED token?? : ${before != after}');
          },
          child: const Text('Delete token')),

Additional context

Add any other context about the problem here.

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Flutter doctor

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Flutter dependencies

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[darshankawar]

Thanks for the detailed report. I see the same behavior using latest messaging plugin version and using the plugin example and using the code snippet shared above.

flutter doctor -v

[✓] Flutter (Channel stable, 2.2.3, on Mac OS X 10.15.4 19E2269 darwin-x64,
    locale en-GB)
    • Flutter version 2.2.3 at /Users/dhs/documents/fluttersdk/flutter
    • Framework revision f4abaa0735 (5 weeks ago), 2021-07-01 12:46:11 -0700
    • Engine revision 241c87ad80
    • Dart version 2.13.4

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.3, Build version 12C33
    • CocoaPods version 1.10.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] VS Code (version 1.58.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.21.0

[✓] Connected device (4 available)
    • Darshan's iphone (mobile)  • 21150b119064aecc249dfcfe05e259197461ce23 •
      ios            • iOS 14.4.1
    • iPhone 12 Pro Max (mobile) • A5473606-0213-4FD8-BA16-553433949729     •
      ios            • com.apple.CoreSimulator.SimRuntime.iOS-14-3 (simulator)
    • macOS (desktop)            • macos                                    •
      darwin-x64     • Mac OS X 10.15.4 19E2269 darwin-x64
    • Chrome (web)               • chrome                                   •
      web-javascript • Google Chrome 92.0.4515.107

• No issues found!

[helenaford]

@darshankawar thank you for confirming and testing it out. I have also opened an issue on the ios SDK repo firebase/firebase-ios-sdk#8491

[Salakar]

Closing since it looks like the upstream issue has been addressed - thanks :)