Hi Chitransh,
Thank you for contacting the Microsoft Community.
I recognize your need of assistance to ensure you will receive the voucher code for the event that you participated in. Be untroubled by worries, allow me to guide you to the correct path.
Upon checking your profile, I noticed that you've another post that being handle by my colleague @Earvin_A014. Please note that he already sent you a detailed response, and currently waiting for your reply.
In addition to what my colleague mentioned, please note that the Virtual Training Day discount is only valid for 90 days from the start of training, and it will not stack with other discounts. (Ex. ESI, Student, CloudSkills Challenge, FTE, etc.) To learn more about the MVTD discount, feel free to check out this sticky post, or visit the Microsoft Virtual Training Day event page, where you will find useful details in the FAQ section.
I will now proceed in closing and locking this case to avoid confusion with the resolution and to keep the threads organized. You can Rest assured that @Earvin_A014 will take good care of your issue and will assist you from here.
Best regards,