Wait, the addresses have to be same? I have my home address for my billing, but my office for shipping since I won't be home.
From what I understand the address have got to be the same for the order but after it is shipped you "might" be able to get FedEx to change the address if Apple will allow them to do so.
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the express checkout toggle has turned off for me twice today. not sure but I hope they check into that and get it fixed.
I remember it also happened to me a few times, kept changing till it stuck.