Hm, ok, if you start the game with only 1 player, does it work?
And if you play the game with 3! players, who is able to use it? Still only the first client? Because the first client is the server and if this is available to everyone, then i guess this is a replication issue.
So you need to let the server do the changes by creating custom events that are replicated from the clien to the server.