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A common issue that prevents parents from submitting their forms is the Priority page. Each contact on that page needs to have a different priority number. If the parents are '1' and '2' for example, the emergency contacts would need to be '3', '4', and so on. Once this is completed, you should be able to successfully submit your form.
This article should walk through the steps of setting the priority settings within the Contacts section of the registration form.
Another common issue that prevents parents from submitting registration forms is the phone type. When a phone number is listed, you will want to choose the type of the phone number such as cell, home, and work.