i have the same bug. i'm from switzerland. there exists a German forum?
i have a 6-5-5-5-4 cd-kay too on the backside of my manual. copy and pasty dont work. it is only fill the first grid with the first 5 letters and numbers. i tried to tip it manual and change some letters and its still dont working. after a time i become a raport that the time period for this cd-kay is over.
i hope you can read it. but English is not my language, and google translator is not the best.