2D - Apply Volume overrides on just one camera

Hi everyone,

I'm trying to use Global Volume on my 2D project to create a chromatic aberration effect on the background. For this, I've set up two cameras, Main camera as Base and a secondary one as Overlay only culling the background sprite.

Now, I need to apply the Global Volume only on my scondary camera. For this, I've created a new layer, label the backgroud with it and use the "Volume Mask" scrollbar to select my new layer. Also, i've unselected the new layer from the "Volume Mask" of my Main Camera. Unfortunately, with this setup no effect appears, and it's only when I select all the layers in the "Volume Mask" of the Main Camera when it shows the effect but on all items in the scene.

Anyone knows what is wrong with that?

Thank you,