I'm developing an app with in-app purchasing and I am getting this error:

You are not authorized to make purchases of this InApp in Sandbox at this time.

I am sure I have everything set up correctly. I've made sandbox accounts for purchasing the items. I have my code intact (thanks to Ray Wenderlich), and I'm pretty sure everything else is in order. But something must not be right.

What could be causing this error?

EDIT:

I'm working on the Xcode Simulator.

ios in-app-purchase app-store-connect appstore-sandbox
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