Hi,
Microsoft Certification vouchers are currently not supported in the Q&A forums, the supported products are listed over here https://learn.microsoft.com/en-us/answers/products (more to be added later on).
You can ask the experts in the dedicated Microsoft Certification Exams - Discounts, Vouchers, Special Offers forum over here:
https://trainingsupport.microsoft.com/en-us/mcp/forum/mcp_exams-mcp_offer
(Please don't forget to accept helpful replies as answer)
Best regards,
Leon