Same. Been checking the email address I signed up with off and on since finishing the campaign early in the month. Check yesterday morning (9/30) on a break at work and saw it was sent Saturday (9/29) afternoon. Cool, finally got my code. Tried the link when I got home and it was already expired. Maybe it was posted somewhere about the expiration date, but the only date I've seen was related to finishing the story by the end of the month. Sure wasn't in the email. Oh well. I figure Bungie will reactivate the link soon - a one day notification isn't much time.