Particles/Effects dont show in network

Hey there,
so, its very simple. I have a network game, which spawns a wizard for each player. When I press 1 the wizard should “draw” its fireball by activating the deactive fireball effect and keep it in his hand. However, the client cant see the hosts fireball, neither does the host see the clients one. Only in Scene view can I see the hosts fireball. I really dont understand.

So, Ive finally got it working. I made a video for it, since this topic is barely covered for everyone else:

Its in german, but still understandable for everyone.