Yes, the fast pass machines do work during EMH, unless they have already given all the fastpasses out for that ride. For the most part, I didn't need them because lines weren't long, but during busier months, I am sure these would come in handy.
We were at MK last week for evening EMH and we needed a FP for Peter Pan and they were available. Not sure about other rides/places but in MK the FP were available.
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