Everything OK except for the zoom function

Have just received the TX for Nikon and also tested simultaneously with the YN 568EX and the SB800. Everything OK except for the zoom. The responding not with me. Is there a special Einstelllung I've overlooked?
If this is just an operator error on my part, there is the missing 2 star, otherwise the unit returns again.

Edit:
Fault lay clearly with me.
Had the set tested without camera and because the zoom is obviously not addressed.
TX flanged to the camera and everything works as it should be.
Therefore, full marks.