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Márcio Henrique Monteiro Welcome to MS Q&A platform.
I see that the certification tab is no more available on the profile page. You can try the below steps to reschedule. Click on profile, go to settings. On the left you will see Connected certification profile. This will take you to the certification profile, and there you can reschedule your exam before 24 hours of the scheduled time.
Hope it helps.
If you have further doubts, you may contact Certification support here