DOF not working....anyone know why?

So I been trying to add a blur with the post process and DOF, now I have done it before but for some reason it’s not working now. I’m using 4.10 and I’m trying to add it to my game. But like I said DOF doesn’t work. White balance and everything else takes affect. So I know the process volume works. I watched some tutorials to see if I was missing something but I don’t see that I’m missing anything. Any tips about this?

Add a Cine Camera and change your f-stop to something small like 1.4 and choose the distance for your focus.