Trying to buy IAP consumables on TestFlight led to a "Cannot connect to iTunes Store" error, whereas testing with Sandbox users went smoothly (100% of the purchases succeeded with no error whatsoever). To investigate the issue further I installed the StoreKit Profile which displayed the following error :
"StoreKitClient: Buy failed with error: Error Domain=SSErrorDomain Code=13 "This Apple ID temporarily cannot be used in the iTunes Store because it could not be found. Try again later."
Any hint on what may causing this issue?