So we got on all 4 elevators multiple times last night and they didn't light up. So on our third run we built the table and then got on the elevators and they light up.
Can anyone else confirm that you must build the table on the roof under the dragon BEFORE you can do the 4 elevator symbols?
I recommend adding building table right after you turn on the power to any guide. Hope that helps anyone that may need it. Good luck.