You can find FIFA World forum here:
But i just checked in game and i don't have 4-2-4. Sometimes they add things but later remove it. Just as the search function to find playernames was taken away some weeks ago just after they brought it in game some hours before due to crashes.
Where does it show 4-2-4? Somewhere on the bottom of the list? In the past i sometimes saw different tactics there but could not choose them.