The '@' key should be shift+2,
also, did you ever try to input the '@' key under english IME(Input Method Editor) with your Norwegian keyboard?
I 'm wondering why you can input it on Mac OS correctly, but in keyboard settings it shown "/".
I have no Norwegian keyboard available, so if you have any other info, please post here.
I will report this issue to Fusion team, hope they can figure it out.
thx.