I implemented in App Purchase in many applications and tested them all in Sandbox. I am currently working on one of the In App Purchase applications that I tested and worked fine yesterday, but this morning, none of the existing sandbox accounts work for the In App test.
I performed one of the apple thread to solve the problem, but nothing works. In this thread, so many developers have faced the same problem, some of them come with a solution, but none of them work for me.
I have already tried the solutions below:
- Add a new product with all metadata and try with a new product identifier.
- Created a new demo app for testing in App Purchase with new certificates and profiles. But does not work.
- A new sandbox tester has been created, check it from your mail account.
I can get product information, such as product name and price, but I can’t complete the purchase. First, when the OS asks you to enter the Apple ID and password for the Sandbox user, I entered it, it accepts the credentials and iTunes logs in using the sandbox user. But then suddenly another operating system appears with Invalid Address.
Find a screenshot of this warning. 
When I clicked Continue, it redirects to the iTunes Store and after some loading displays a different warning with iTunes account creation not allowed. Below screen for this warning.
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