Have you identified yourself as a student in your certification profile?
Based on my research, to qualify, identify yourself as a student in your certification profile and verify your academic status. Once verified, you’ll receive the student discount when registering for an exam.
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Maybe one of the links is helpful:
Microsoft Training & Certification is supported on their own forums:
Microsoft Certification - Exams: https://trainingsupport.microsoft.com/en-us/mcp/forum/mcp_exams
Microsoft Certification - Exam Registration: https://trainingsupport.microsoft.com/en-us/mcp/forum/mcp_exams-mcp_exam
Microsoft Certification - Vouchers/Discounts: https://trainingsupport.microsoft.com/en-us/mcp/forum/mcp_exams-mcp_offer
Pearson VUE Support:
Pearson VUE - Customer Service: https://home.pearsonvue.com/Test-takers/Customer-service.aspx
Pearson VUE - Chat: https://home.pearsonvue.com/microsoft/contact
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