Having trouble completing the pre-order process for an iPhone 13? Me, too

Apple offers a pre-approval process for ordering an iPhone 13. You can access it via the App Store app on an iPhone or iPad. The goal is to speed up the process of placing an order starting at 5 a.m. (Pacific) on Friday, Sept. 17.
However, I’m experiencing issues with the pre-approval process. I’ve selected all the options (the model I want, color, storage options, wireless provider, AppleCare preferences, trade-in option, etc.). However, there’s no submit button or choice, so I’m unable to complete the process.
I contacted Apple support. I was told that the glitch is likely due to a high number of pre-orders going on. I was told to try back in a couple of hours. 
I will and I’ll let you know what happens. If you’ve experienced the same and have found a  solution, feel free to tell us how you did it.
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