Promo Codes not supported

[janlueders]

Version of flutter_inapp_purchase: 5.6.1

Platform: iOS

Open Redeemsheet with a bound product to.

The redeemsheet will be opened without bound to a product id.
When you are using the link apple offers the you'll be redirected to the AppStore and the user needs to get back manually.
i would expect that i can call the showPromoCodesIOS with a product id. Else it coudlnt be able that you have the appName filled, and the icon set.

When i'm entering a promocode then i'm receiving every time the error that the code couldn't be found

Tested environment (Real Device)

Steps to reproduce the behavior:
FlutterInappPurchase.instance.showPromoCodesIOS();