Restore Purchases issue Flutter - iOS

Hello,

I'm encountering an issue with my Flutter app's in-app purchase (IAP) functionality, particularly with restoring purchases on iOS.

My app offers a non-consumable premium version that provides lifetime access to certain features. However, during the App Store review process, I received a rejection due to the following reason:

Guideline 3.1.1 - Business - Payments - In-App Purchase

"We found that your app includes a feature to restore previously purchased in-app purchase products by entering the user's Apple ID and password. However, in-app purchases cannot be restored in this manner."

While the restoration process works smoothly on Android without any sign-in prompts, on iOS, it triggers a sign-in prompt, leading to the rejection.

it only happened for app store, everything was fine for google play

Here's the relevant code snippet from my app:

static Future<void> restorePurchases(
    PersistenceViewModel persistenceViewModel, BuildContext context) async {
  try {
    CustomerInfo customerInfo = await Purchases.restorePurchases();

    // Handle restored purchases
    if (customerInfo.allPurchasedProductIdentifiers.contains(premium)) {
      // Handle the restored product identifiers
      if (kDebugMode) {
        print('Premium version restored');
      }

      // Here I make the user premium if successfully restored
      await persistenceViewModel.setPremium(true);

      // Show Alert
      if (!context.mounted) return;

      showDialog(
        context: context,
        builder: (BuildContext context) {
          return const ShowRestoredAlert();
        },
      );
    }
  } on PlatformException catch (e) {
    if (kDebugMode) {
      print('Error restoring purchases: $e');
    }
  }
}

I'd like to resolve this issue and ensure that the restoration process works seamlessly on both iOS and Android. How can I modify my code to achieve this without triggering the sign-in prompt on iOS?

Any guidance or suggestions would be greatly appreciated.

Thank you in advance!