Can't change phone with Ford Sync

Got a new phone. Was able to get the bluetooth working with my Ford Fusion but in order to use Ford Sync services, it's required to register your phone number on syncmyride.com. Unfortunately there is a bug on the website which disallows me from adding a new phone number and switching to it.

On July 18, I sent a message through the contact form on the website and got a reply back on July 20:
"Jim,

Thank you for your email in regards to updating phone.

We do apologize, please try again to update your cell phone number, our website has undergone some update which may have affected adding the number at that time please try again.

Sincerely,

Ulysses
Ford Motor Company
SYNC Support Center"

So today I tried again and got the same message.

Really irritating because (a) I can't imagine I'm the only one with this problem and (b) I can't use the sync service until I change to the new phone number. As I stated in the previous article, the Sync is cool but it is poorly maintained and only the brand new cars get all the features. As they add new features, they do not allow the really good ones (like App Sync) to work with previous Fords.