Nothing is added ON a magic band. A magic band is just a key that unlocks the info within your MDE account. As long as you have a magic band(s) linked to your MDE, then any tickets, dining reservations, fast passes, etc are able to be accessed via your magic band reading the info in your MDE
As the PP's noted, yes you can have an AP linked to your MB. Actually, the AP is on your MDE account. The MB is just a window to the MDE account. That means that you can use any existing MB's as well as any new ones with your AP seamlessly.
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