Customers can't checkout as guests

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When my customers are going to check out as guests & put in their email- a window pops up asking for a code, so they get a text with that code. Then when the page reloads it's the same thing over & over, asking them to start over again. There's a glitch. What happened to the customer service?! Part of the appeal of owning a shopify site is the ability to reach a human to help on the phone.