Hi abel,
Thank you for contacting the Microsoft Community.
I recognize the importance of securing the discount obtained from the completed Microsoft Azure Virtual Training Day for your exam. Let me take immediate steps to help you.
As per the updated MVTD sticky post, participants of the Microsoft Virtual Training Day Event will receive a 50% voucherless discount linked to the email address used for registration. Additionally, they will receive a "Thank You" email within 4 business days after completing the training, which will include instructions on how to claim the offer. It is important to use the same sign-in email associated with your Learn profile when registering for the MVTD event to ensure smooth verification and avoid potential issues.
You may also consider checking your spam or junk folder as thank you email may be routed on those files.

Additionally, I recommend reviewing the MVTD discounted exam FAQs, as the discount is only valid for 90 days from the event date.
I look forward to your response. Please note that if no response is received after two business days, the case will be closed and locked. After the case is locked, we will no longer be able to respond. Thank you.
Best regards,