iOS purchases made using a promo code aren’t being recognised in my app. Initially I take a user to the URL below from my app. Once they come back Purchases.syncPurchases() is called. I also have a button in the same page that calls Purchases.restorePurchases(), but pressing that seems to have no effect as well. I do have a listener for any changes in the customer information using this Purchases.addCustomerInfoUpdateListener((info) {}), it starts when the app is opened. Once a promo code has been used successfully and the user comes back to the app and the syncPurchses method is called there is still no update in customer info. My app is in production (available on app store) and I already have in-app-purchses/subscriptions working and fully integrated. What is going wrong here?

https://apps.apple.com/redeem?ctx=offercodes&id={apple_app_id}&code={code}