I changed an app from paid to free with in-app purchase. I implemented a mechanism that should have given paid users access to the IAP but it didn't work for everyone. Now I am using promo codes to restore the premium features IAP for those who purchased the paid version.
Several users told me their promo codes worked on their phone, but not on their iPad. Is there a way to get one promo code to work on both?
I sent an additional promo code to users with iPhones & iPads. Some user told me that when they tried to redeem the 2nd promo code on their iPad, they received a message saying they had already bought the app. However, premium features still didn't unlock.
Does anybody have a solution?
