While creating signature for Introductory Subscription Offer Can any one guide how to get "offerIdentifier" in developer guide line it is give that offerIdentifire will be available at -" The subscription discount identifier, identifier. The app can provide this value." but I'm not able to find it. I am follow this link: https://developer.apple.com/documentation/storekit/original_api_for_in-app_purchase/subscriptions_and_offers/generating_a_signature_for_promotional_offers

I have added 2 Subscription for my app. I have "Promotional Offer" discount too for the subscription. But While testing SKProductDiscount shows Discount count 0 and an alert is showing which say "You are not eligible for offer". I have attached the screenshoot too. Can any one help to resolve this issue. Thanks