Post Processing volume with 2d collider

I'm making a 2d game and I want to enable a vignette when a player enters a certain area. I can't figure out how to use a local volume to make this happen, because even as the camera enters the area, it doesn't enable the effect. I know it's not a problem with the volume because the vignette applies in the scene view as well.

I could use a global volume and enable/disable it but a local volume would be way easier.