I'm making an obstacle course where i have to jump over a rotating arm. When the arm hits me i'm not pushed when i'm standing still

I’m making an obstacle course where i have to jump over a rotating arm. So i want it to push my character when it hits me. I also don’t want to people to jump ontop of it. So I set walkable slope override to unwalkable. When i do that I cant jump on it as intended but now when the arm hits me i’m not pushed when i’m standing still. I just clip through it.