Expo RevenueCat using TestFlight - The receipt is not valid

I have integrated into our React Native Expo app RevenueCat, following all the guides step by step.

I publish the app to TestFlight today and I can see the purchase popup and product information correctly. 

After purchasing the product I see a message saying: “You’re all set, your purchase was successfull.”

And just after that message we are doing an alert with the value of “productIdentifier” property.

const {customerInfo, productIdentifier} = await Purchases.purchasePackage(expertAdvicePackage);
    Alert.alert(JSON.stringify(productIdentifier));

The alert shows this:

We already checked bundle id and app shared secret and everything matches exactly as in the AppStore. 

This is killing me because I can’t pass this point and need to move this into production asap.

Appreciate any help or advice.

Kind regards,