Just finished ordering my Moto X for VZW on Moto Maker.
First order was cancelled because - I didn't think this was an issue - the billing address and shipping address were different. I can see why Motorola wants to keep some sneaky people who order a phone and have it shipped somewhere else on a bogus charge card, in my case I have a PO box as the shipping address and credit card was the billing address. <I'm not a sneaky person>
Second time ordering, I did almost the same thing! At least it showed up that way on the order page and that got cancelled. I probably was a little bit frustrated and in a hurry as the Verizon $50 off was going to end soon so wanted to get that order in. My billing address was still different than the shipping address as I changed the ship to address to a physical address instead of my PO box.
So -third time's a charm- I decided to add a physical address to my credit card billing address as it only had a PO box for billings.
That worked! The order form showed BOTH shipping address and billing address to be the same (both real live addresses).
Ahhh...now the wait begins. Hope this helps someone.