I have got the scale working for me and sent an invite to use the scale to my wife. She gets the email and clicks the accept invitation link. When she steps on the scale it pops up an error message saying "Your weight can't sync to this Fitbit account. The scale has been reset or wasn't set up properly." The options are then to set up the scale now or later. If you choose now, it complains that it is already connected to another account and tells you to ask for an invite (which is how we got here) or reset the scale (which starts the whole process over from the first user).
