Welcome to Microsoft Q&A!
Currently, Microsoft Q&A is under a public preview. Your issue about app submission is not supported right now. Derive from official document. When you finish creating your app's submission and click Submit to the Store, the submission enters the certification step. This process usually is completed within a few hours, though in some cases it may take up to three business days. For this case the better way is open support ticket. And you will get response quickly for store submission problem.