Why can't I animate a shape along the path of another shape?

This is definitely user error, but I’m clearly forgetting some of the most basic AE knowledge. Nothing on Google is helping me. I have two shapes. A line and a circle. I’m trying to copy the ellipse’s path to the line’s position so the line will follow along the circle’s path. Yes, I’m aware of just using a trim path on the circle but that’s not the end goal here. Anytime I copy the ellipse’s path and paste it on the line’s position, it just pastes a “Group 1.” How can I properly copy the ellipse’s path so that the line follows it?