When attempting to use apple promotional offers for subscriptions I consistently receive the popup that says "Offer Not Available" for both production and sandbox. Without offer code purchase working fine. I have verified the App Store Connect setup and client side code and even created new offer codes also, but I have hit a dead end.
Error:- (Error Domain=SKErrorDomain Code=18 "(null)" UserInfo={NSUnderlyingError=0x280dbb0f0 {Error Domain=ASDServerErrorDomain Code=3904 "Offer Not Available" UserInfo={NSLocalizedFailureReason=Offer Not Available}}})