@Rohit Kshirsagar Q&A forums currently don't support queries regarding certification.You can post your query here which is dedicated forum for MS Learning community.
What I came to know is that Microsoft is temporarily waiving the reschedule and cancellation fee as long as you cancel your exams within 24 hours prior to your scheduled appointment.
Please cancel the existing appointment and register for the desired exam using the same voucher code.
Note: Please wait for 24-30 hours before rescheduling.
FYI: select At Home or Office radio button in-order to give the exam from home.
Please 'Accept as answer' if it helped, so that it can help others in the community looking for help on similar topics