Are you playing on Android? Android doesn't support external text box opening - normally a box would pop up asking you to enter the key. Instead, it'll just play the text as if you put the code in wrong.
I have a silimar ploblem like this.I play this game have used a tablet with windows system ,such as surface.I can't use windows virtual keyboard call the game setting and control them when I play the game online(but no poblen that using mouse).so i can't type anything.
