Flutter Purchases.getOfferings return nothing for i os

Hello,

I have issue in flutter on iOS,
getOfferings return nothing after setup subscription in App Store connection and setup App Store configuration in revenue cat

_purchaserInfo = await Purchases.getPurchaserInfo();
_products = await Purchases.getProducts(kProductIds);
_offerings = await Purchases.getOfferings();

it works ok for google.
I did everything as it show in https://www.revenuecat.com/blog/signing-ios-subscription-offers
Purchases.getPurchaserInfo return correct information

Using Purchases.syncPurchases(); return exception “The receipt is missing.”