Why Flutter RevenueCat for iOS getOffering null? - flutter

I am using Revenuecat for in app subscription for android and ios. I successfully implemented revenuecat in app subscription for android. But I am not able to implement in iOS. I have followed all the steps to setup revenuecat subscription for ios in apple developer console and revenuecat.
When I tried Purchases.getOfferings() it is always returning Offerings{current:null, all:{}}. I am running app on iOS simulator.

Your configuration is empty. make sure you have add these configuration.
https://docs.revenuecat.com/docs/in-app-purchase-key-configuration

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