I tried to schedule my certification exam for AZ-900 and I am getting the following error 
I tried to schedule my certification exam for AZ-900 and I am getting the following error 
There is a known issue with this right now, but as DSPatrick mentioned you will need to reach out to PearsonVue support as certificate scheduling is owned by them.
Microsoft Certification Program is supported on their own forums. I'd try asking for help with exam scheduling in dedicated forums here. (Participate\Ask A Question)
Exams/Exam Registration/General Registration Questions
Exams /Exam Registration and Scheduling/Scheduling with Pearson Vue
Pearson VUE Customer service
Pearson VUE contact / chat
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