iOS Offer Code show a message error "this offer already expired"

I'm trying to use iOS Offer Codes in my app. I've implemented presentCodeRedemptionSheet() method to show redemption view. In the App Store Connect i've setted and created 500 offer codes. After downloaded i tried to use them in my app, but for every code i use, it shows a message error: "this offer already expired". I'm sure that the codes are valid.