Client can't activate UI to call Function (Multiplayer)

All clients can open and close the door if (Use UI/On collision True) the player walks onto the Collision box in the Terminal BP.

I then hook that same event up to the UI ( which references the parent Terminal BP, which in-turn has the Open Door Event.
Only the Server player (has Authority) can activate the UI but none of the clients can.
I want to be able to as Clients activate the Button and the door should open to all clients.

What am I doing wrong here? It’s been driving me insane!