I tried this today, and it worked great
However, my mom who is going during the same time could not get it to work. When she logs in it gives her just the next 7 days, she can't get to the days she will actually be at Disney per her reservation (MK day is Sept 1). It also shows a party of 2 when her party is 5.
The only thing I can think of as to why it doesn't work for her is that she had planned a trip for earlier this spring for a party of 2 that she ended up canceling. Perhaps she checked for a reservation back then (with the canceled trips 10 digit number) so the system is not "seeing" her current 10 digit number with the trip she is now taking with a party of 5. Is there any way to verify what 10 digit number the system is using?
Of course the Disney IT people cannot assist her, I was wondering if anyone on the DIS has any advise for her? She is distressed because she really was looking forward to this, and I feel bad I got it for my party with no problems.