My codes did not work - had them created after the extention in January and looks like tht codes generated have wrong validity in their (LH's) computer system. You can try to call the internet helpdesk of your country of origin and see if they can re-issue a code, but I guess it is more likely to loose a good fare in the time they need to understand, and verify the problem - as well as sending a new code.

Cheers,
G