Notice that this student has already been issued a fob
While assigning a fob to a student for it to indicate that this student has already been issued a fob. This would be beneficial when a student is taking multiple classes in a semester. I have been assigning fobs for multiple classes at a time and can't take the time to see if I had already issued a particular student a fob. It a message "popped up" it would be helpful.

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Mon Nasser commented
Students are only allowed ONE fob for use with AccuClass. If you assign a new fob to the student, then the old fob will be 'inactivated' and will no longer work for sign. This is handy for when the student loses a fob as all you need to do is assign them a new Fob and the old fob will no longer work. With this system, students only need ONE fob for all their class sign-ins.
If students are unaware of the above, you might want to ask them whether they have a fob before giving them a new one.
Flashing a note about that might also be useful, so we will consider that for a future update.