I have implemented the Unity IAP with PlayFab example at: https://github.com/nekojoker/UnityIAPForPlayFab/blob/master/Assets/Scripts/IAPExample.cs*. At first it worked exactly as expected, with maybe a 10% failure rate. However, over the past week it is failing consistently with the message: Purchase of this item is not currently available. The item is being modified. Please try again later* (Presumably from the Apple App Store?). I have made no changes to the code. All of the items for which I get this message have previously worked properly, so the settings in the catalogue and App Store are correct. When it succeeds the Player inventory is updated properly.
Has anyone else run into this issue? Any help would be much appreciated. OSx 12.6.8