I'm getting unexpected error issue continuously even after sign out and sign in again and clear cache and cookies

For continuous “unexpected error” issues when trying to schedule a Microsoft certification exam, the most common cause in this scenario is a Pearson VUE account block, typically triggered by multiple failed payment attempts.

To move forward with scheduling the exam:

1. Contact Pearson VUE support so they can check and remove any block on the account. Use the Pearson VUE contact path provided via the Microsoft Certification support page: https://aka.ms/CertificationSupport.
2. After Pearson VUE confirms the block is lifted, try scheduling the exam again.

If the error persists even after Pearson VUE confirms there is no block, open a support case through the Microsoft Credentials support channel so the issue can be escalated.

References:

• Exam schedule error - Microsoft Q&A
• I am not able to register for sc200 exam. It;s showing unexpected error. - Microsoft Q&A