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Invalid product ID error - ios in-app purchases


I’m trying to add in-app purchases but getting the Invalid product ID error.
I made it all by the Apple guides and double-checked it but still have the error.

Could you please tell me what’s wrong here?

error(__C.SKError(_nsError: Error Domain=SKErrorDomain Code=3 "Invalid product id: NWPremium" UserInfo={NSLocalizedDescription=Invalid product id: NWPremium}))