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I have a Flutter App in which I am using the Qonversion SDK for in App Subscription. I have made the required settings for the iOS. But when hit subscribe it does not open the purchase pop up, it returns me this error in Test Flight.
1: Additional Message: Internal Error Code: 10008
2: Error Code: FraudPurchase
3: Error Message: not_authenticated
I am unable to find any possible solution from the documents.

This is my code for making a purchase:

    return {
      "paymentStatus": true,
      "qEntitlement": qEntitlement,
      "reasonPhrase": "Payment Success"
    };
  } else {
    dev.log(
      "[QonversionService] Purchase successful but Entitlement is Empty!!!",
    );

    return {
      "paymentStatus": true,
      "qEntitlement": null,
      "reasonPhrase":
          "Payment Success but Nothing Returned in entitlement!!!"
    };
  }
} on QPurchaseException catch (e) {
  if (e.isUserCancelled) {
    dev.log("[QonversionService] Purchase Cancelled by the User");
    return {
      "paymentStatus": false,
      "qEntitlement": null,
      "reasonPhrase":
          "Inside QPurchaseException: Purchase Cancelled by the User\n${e.message}"
    };
  } else {
    dev.log(
      "[QonversionService] Purchase Exception: \nError Code: ${e.code}\nMessage: ${e.message}\nAdditional Message: ${e.additionalMessage}",
    );
    return {
      "paymentStatus": false,
      "qEntitlement": null,
      "reasonPhrase":
          "Inside QPurchaseException: \nError Code: ${e.code}\nMessage: ${e.message}\nAdditional Message: ${e.additionalMessage}"
    };
  }
} catch (ex) {
  dev.log("[QonversionService] Unexpected error during purchase: $ex");

  return {
    "paymentStatus": false,
    "qEntitlement": null,
    "reasonPhrase": "Inside Catch: $ex"
  };
}