This post is from the WWDC26 StoreKit, In-App Purchase, and App Store Server API Q&A.
Is redeeming an offer code during an active introductory free trial a supported flow with StoreKit?
Hello @mowerb, yes this is a supported flow, to redeem an offer code while the subscriber has an active introductory free trial. See https://developer.apple.com/help/app-store-connect/manage-subscriptions/set-up-subscription-offer-codes/ for more information on how you can configure eligibility for offer codes, including allowing active subscribers to redeem the code.