They asked me for an account still.
another way is to get on the phone and tell your story. if you try hard enough you will eventually get thru.
having an account just limits customers from unlocking every Iphone AT&t phone globally. this was supposed to be a local service for stateside and for official At&t customers. they really do us a favour when they accommodate foreign requests. If at any point of time if you were a genuine aT&t customer you would have an account and the required details. If you bought the iphone second hand from gumtree, craigslist, eBay ot wherever then its tougher as iphone is linked to an account unless you use it on your number on at&t, link it and then unlock it.
95% problems are occurring because members are willing to unlock and are not even in the US. Its still possible but way more complicated.