Networking Render Custom Depth

i’m trying to make a simple item under crosshair selection with render custom depth, here’s a screenshot

it works fine for singleplayer but i don’t have a big knowledge about networking
what i understood from what i read on the answerhub is that if i want the information to only be viable to the client doing the action i should use run on owning client but it doesn’t seem to work for me.
the server can’t see the highlight of the clients but the clients can see the ones of the server.