My blueprint is not working on multiplayer

I have a flashlight blueprint

It start off, and with “t” you can toggle visibility. When I start in multiplayer mode, clients can’t see the other players flashlight. Only the server can see the clients flashlight.

All the variables are replicated. Where is my problem?

Your problem is not learning how multiplayer works. Go watch some tutorials.
Also this is handy (but after you know basics of multiplayer): http://cedric.bnslv.de/Downloads/UE4_Network_Compendium_by_Cedric_eXi_Neukirchen.pdf