Maybe I wont play SH 4 afterall?

[simsurfer]

I installed the game, patched it with the U-Boat update, now when I go to play it asks for me to activate the product. I enter the serial # on the back page of the paper manual and I get an error code saying invalid or wrong key. I have typed it with lower and upper case, used the - mark between the keys and not, still getting the error.

Is there a fix to this or can I finally trash SH 4 once and for all?

Thanks