rohit.khurmi095,
For issues with your Learn Profile, Certifications, and Exams (including registration and scheduling), please reach out on the Microsoft Certification forums:
https://trainingsupport.microsoft.com/en-us/mcp
I also really like including a direct link to the topic/sub-topic. Examples:
- Rescheduling of AZ-900 exam - Microsoft Q&A
- Having trouble rescheduling AZ-900 exam - Microsoft Q&A
- 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