Delete Short cut TP3


Hello, I have a problem. I can’t make a short cut in service menu for deleting stuff. The usual key is Control-Shift-K. It doesn’t appear in TP (item menu - only Delete shown). The short cut works with another account but not on mine. I have carrefully read all shortcuts in the service menu and there is no conflict. Service accepts the shortcut but it doesn’t work on task paper. Can you help me please ? Kind regards