Exam voucher from Microsoft Ignite

I attended the Microsoft Ignite conference online this past year and completed one of the challenges to get a free exam voucher. However, when I try to click on the link in the email I received to claim the voucher and schedule the exam, it tells me the link has expired. Is there any way to get a new email with a new link? I've tried responding to the email as there isn't any kind of contact info on the email itself but haven't received any response yet.