Multiplayer Controls don't work (Wii)

[Hebas]

Hello,

I want to play New Super Mario Bros Wii with a Friend (NetPlay).
He can join my Server and we also can chat together, but when I start the Game, we can't skip Intros etc. (both of us are playing with Keyboard and mouse)
Well, the curious thing is that in Singleplayer the controls work, I can skip Intros, move character etc.

We can't figure out what the solution is, it would be nice if you could help us.

Thanks!
Hebas