Don't panic! We have all been there.
Not sure if they still have the stupidly small label that needed a magnifying glass to read but try 'nought' instead of the letter 'O' and vice-versa.
The same with '2' and the letter 'Z'.
I have installed this game many,many times and never get it right first time.
Eventually I put it into a notepad file so I could paste it into the box,so much easier
I use all upper case and the dashes must be there.