I checked in 3 days ago and had the same issue reported here, "yellow highlighted fields must be completed" when, first, there were no yellow highlighted fields (more of an off white but not the usual yellow highlight), and second, all the off-white fields WERE filled in. I changed the zip from the 9 digit contiguous number they had (which was correct, btw), to our 5 digit zip and it worked.
Can I just tell you how much Disney's websites, all of them, stink so so bad? They are just terrible. I see text running over illustrations, outside of information boxes, this won't work with Safari, etc.