Sequence doesn't play from blueprint

So, must be missing something somewhere, but I have tried both methods of playing sequences from a blueprint that I’ve seen in tutorial videos working for other people (I’m working in 5.0). I can see the sequence in my sequence player, but I can’t trigger it with a key or even with event begin play. What are the things I should be looking for? Hunting down…?

er, any help here, y’all?