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Microsoft Certification / Exams is 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 refer to a similar discussion and see if it helps you.
Microsoft Certification Program is supported on their own forums. I'd try asking for help with exam scheduling 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
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