[FIREBASE_APP_CHECK] receive expired token instead of new token

[ChanakaWeerasinghe]

Is there an existing issue for this?

• I have searched the existing issues.

Which plugins are affected?

App Check

Which platforms are affected?

iOS

Description

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Description

When using Firebase App Check in our application, we are intermittently receiving an expired token instead of a freshly issued one. This issue causes subsequent API requests to fail due to invalid or expired token errors.

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Expected Behavior

The Firebase App Check service should return a new valid token that is not expired.

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Actual Behavior

Firebase App Check intermittently returns a token that is already expired, causing failures in secure operations dependent on the token.

Reproducing the issue

Steps to Reproduce

1. Integrate Firebase App Check with the app using the recommended setup.
2. Request a new App Check token from the Firebase SDK (e.g., using getToken() or any similar API).
3. Inspect the received token and attempt to validate or use it for a secure API call.
4. Observe that the received token is already expired at the time of retrieval.

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Firebase Core version

2.0.4

Flutter Version

3.0.7

Relevant Log Output

No response

Flutter dependencies

Expand Flutter dependencies snippet

firebase_crashlytics
Version: ^3.3.3

firebase_analytics
Version: ^10.4.3

firebase_messaging
Version: ^14.6.3

firebase_dynamic_links
Version: ^5.3.3

firebase_remote_config
Version: ^4.2.3

firebase_core
Version: ^2.14.0

firebase_performance
Version: 0.9.2+5

firebase_app_check
Version: ^0.2.0+1
Replace this line with the contents of your `flutter pub deps -- --style=compact`.

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### Additional context and comments

c. cx

[SelaseKay]

Hi @ChanakaWeerasinghe, could you upgrade your plugin version to see if it resolves your issue?