Why setting App Attest environment to production removes the App Attest capability in iOS?

[zenkog]

Look at this video to demonstrate what I mean.

Using firebase_app_check: ^0.0.6+3

What I have done (according to this doc):

1. Enabled the App Attest in the Firebase console.
2. Added the App Attest capability in xcode
3. Changed the App Attest environment to production in the .entitlements file.

But each time I changed the environment to production, the App attest capability disappeared. And when I re-added the App Attest capability, the environment reset to development. And the cycle continues.

Moreover, my app always gives an error saying App Not Registered while in fact, it is and all other Firebase functionality works. So I thought maybe the problem lies in the fact that I cannot add the capability.

Here is my `flutter doctor -v`

[✓] Flutter (Channel stable, 2.8.0, on macOS 12.1 21C52 darwin-x64, locale en-US)
    • Flutter version 2.8.0 at /Users/ME/development/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision cf44000065 (12 days ago), 2021-12-08 14:06:50 -0800
    • Engine revision 40a99c5951
    • Dart version 2.15.0
    • Pub download mirror https://pub.flutter-io.cn
    • Flutter download mirror https://storage.flutter-io.cn

[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    • Android SDK at /Volumes/ME/Applications/Android/sdk
    • Platform android-31, build-tools 31.0.0
    • ANDROID_HOME = /Volumes/ME/Applications/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7281165)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 13.2)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • CocoaPods version 1.11.2

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

[✓] Android Studio (version 2020.3)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7281165)

[✓] VS Code (version 1.63.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.29.0

[✓] Connected device (2 available)
    • zk iPho (mobile) • 00008101-09656001E • ios            • iOS 14.8.1 18H107
    • Chrome (web)        • chrome                    • web-javascript • Google Chrome 96.0.4664.110

• No issues found!