Hi Lorraine,
It takes up to 5 business days after the virtual training day(s) to receive the email with your voucher code. Expect an email with subject of "Thanks for joining the Power Platform Fundamentals training day" or similar and scroll down near the bottom for your discount voucher code.
Microsoft Virtual Training Day (MVTD) event
Please click Accept Answer and upvote if the above was helpful.
Thanks.
-TP