Help needed recoding a 1 button Impreza Key

[Wolfcub1963]

Hi Everyone, can anybody help me get my second key coded to my car again. It is a 2007 Impreza Sti RHD with the keypad in the small drawer by the drivers door. I have tried the method on Autodata and it seems to work on my first key but not the other. I have just sent the second key to be checked who tell me it is all working but it wont link to the car so I'm either trying the wrong method or there is a fault in the key.