Hi Vikas,
Thank you for contacting the Microsoft Community.
I understand how meaningful it is to access your exam discount, especially as you work toward your certification goals. It's great to see your enthusiasm, and I’m here to ensure we explore all possible avenues to get this sorted out.
To proceed, please provide the following details requested via private message (see the image below) I have initiated.

Click here to access your private message
Meanwhile, if you originally received your voucher through a Microsoft event such as the Microsoft Learn AI Skills Challenge, I recommend reviewing the program’s details here to better understand the eligibility and redemption process: Microsoft AI Skills Fest - Challenge and Sweepstakes Official Rules | Microsoft Learn
Otherwise, if the voucher was purchased through another promotion, checking the source where it was obtained could help validate the voucher number or determine if a replacement can be issued. Please note that vouchers are subject to specific terms and conditions, and if yours was acquired through a third-party event, reaching out to the provider may clarify its eligibility and potential next steps.
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, even through Private Messages. Thank you.
Best regards,