Hi!
I am working with IAP, and I have a group of two subscriptions: Monthly and yearly. I created a lot of sandbox users in order to test that. When I purchase a subscription it is ok. But when I try to change (monthly to yearly or vice versa) I receive this error:
Error Domain=SKErrorDomain Code=0 "Cannot connect to iTunes Store"
My app receives the error and handle with it, but magically the subscription is signed!!! Is this a sandbox user error? I already created a lot of sandbox users, but it happened with all of them.