Meta key not working - somehow

I've just installed FuryBSD, so I am running FreeBSD 12.1, with XFCE in my case.
I want to enable the 'tile to left/right' hotkey, using the shortcut super-left and super-right.
Using the XFCE Window Manager settings, this is no problem: the key is recorded correctly, reported as 'Super-Left' and 'Super-Right' - but it does not work.
So the key code is read in one program, but not in others? How is that possible? First thought was, maybe a wrong keyboard layout - but then it would not work at all?
Any hint what I could check?
 
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