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You can only reschedule an exam 24 hours BEFORE the exam date time. You will be marked as a No Show for the exam.
https://learn.microsoft.com/en-us/credentials/support/reschedule-and-cancellation-policy
Be sure to reschedule or cancel exam appointments at least 24 hours before your scheduled exam or your fee will be forfeited. If you used a company-purchased voucher, the voucher will be forfeited. If you no-show for your exam appointment, your Company may be charged a no-show Fee. Visit registering and scheduling an exam to review the latest updates to the exam scheduling policy.