We encountered an unexpected error. Please try again later. If this issue continues, please contact site support.

The error when trying to schedule or purchase a Microsoft certification exam (such as AI-900) is commonly caused by an issue on the exam provider side (Pearson VUE) or with the certification profile/offer on the Microsoft side.

From similar reported cases:

1. If the error text or code indicates a Pearson VUE block (for example, ERROR_VUE_WIDE_BLOCK), this usually means the Pearson VUE account is blocked, often due to multiple failed payment attempts. In that situation, the block must be removed directly by Pearson VUE support.
   • Use the Microsoft Certification Support entry point at: https://aka.ms/CertificationSupport and follow the guidance there to reach Pearson VUE support so they can check and unblock the account if needed.
2. If there is no specific Pearson VUE error code, or the issue is with applying a voucher/discount or completing the last step of registration, use the official Microsoft certification support channel:
   • Go to the certification support page at: https://learn.microsoft.com/en-us/credentials/support/help
   • Open a support request under the Certification/Exams category, describing that an “unexpected error” occurs at the final step of booking AI-900. Include screenshots and the exact time and region, so support can investigate the backend issue.

These issues cannot be fixed from the client side; they require either Pearson VUE or Microsoft Certification Support to review and correct the account or booking configuration.

References:

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