@ key on Apple BT keyboard does not work?

After installing Win 10 on an 2014/5 Mac Mini using Boot Camp my Apple BT keyboard @ sign does not work, any ideas ?

Mac mini (Late 2014), OS X El Capitan (10.11.5), Boot Camp
Has invited:

howapple - hello

Favor from:

Not work where?


Windows in Boot Camp?

If yo boot to Recovery does @ it work?

OS X: About OS X Recovery - Apple Support

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