Microsoft Certification Program is supported on their own forums. I'd try asking for help with certificate in dedicated forums here. (Participate\Ask A Question)
Exams/Exam Registration/General Registration Questions
Exams /Exam Registration and Scheduling/Scheduling with Pearson Vue
Pearson VUE Customer service
Pearson VUE contact / chat
Hope this helps!
Kindly let us know if the above helps.
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