Flutter: Promotional Offers for subscription

Howdy,

We setup our product and added the promotional offer for an subscription into appstoreconnect & we added an offer into the adapty product.

But whenever i try to call the presentCodeRedemptionSheet() (and enter the correct code)or https://apps.apple.com/redeem?ctx=offercodes&id={apple_app_id}&code={code} with the correct data, apple says that the code is not valid.

i can not find a proper documentation how to set it up correctly from appstoreconnect into adapty / the app.