I keep reading about MBs not working properly. What happens to your FPs when this happens? How do you prove you have a FP? Are they good for later? Just want to be prepared in case this happens on our trip. We haven't used MBs before.
Just know that that your FPs are not "on" your MB.
There is no reservation info, or ticket info, or credit card info, or FP+ info "put onto" a MagicBand.
A MagicBand only contains a unique serial number that is used to access the information that is stored in a guest's MyDisneyExperience file.
When the MagicBand is touched to a "Mickey Head Reader,"
the MB's serial number is read and that number creates a an instant connection to the guest's
MDE account info.
The MagicBand works like the combination to a locked safe, or a key to a locked door.
The MB, itself, is not the container of the ticket or FastPass, or Room key number, etc.
The MB just
unlocks the guest's file of info, allowing it to be accessed from her/his MDX account when needed.
If you want, you can go to any ticket booth or Guest Relations and pick up a free CARD that will work for
park entry and FP entry as a "back-up" for your MB.