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You can only reschedule if there is more than 24 hours before the exam start time. Your exam appointment is on your Learn profile https://learn.microsoft.com/users/me/credentials/?tab=credentials-tab
See https://learn.microsoft.com/en-us/credentials/support/reschedule-and-cancellation-policy#how-to-reschedule-or-cancel-your-exam on how to reschedule your exam