I meant the slot in the animation blueprint and the montage. So I would make sure that the montage you want to play uses the “DefaultSlot”.
So those two need to be the same, otherwise the montage won’t play. So if your montage uses the “DefaultSlot”, then I would try to pin down the problem. First I would make sure that the montage does play correctly by putting the bot in the level with the default AIController so it does not execute any behavior and then directly call “PlayMontage” on a timer to see if that works. If it does, then something is going wrong inside the attack event or you interrupt the montage (so you could check whether or not the “OnInterrupted” executes).