Error using Promo Code with iPhone

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Any one else having issues with customers not being able to checkout on ecommerce site, when using their iPhone and entering a Promo Code? I discovered a few days ago customers are not able to do this. They get all the way to the checkout page and when they hit Pay Now it does nothing. I tried it today from my iPhone and entering a valid promo code and it does not work. Was on chat with support 3 different times and they've said there was nothing wrong. Was on support today for over an hour and finally escalated to a technical support person as there is definitely something wrong.  Wondering how many sales/howmuch money I've lost due to this glitch?