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The error message during AZ‑900 exam scheduling is a known type of “unexpected error” that can occur in the Pearson VUE/Microsoft certification flow.

Based on similar reported issues, use these steps:

1. If the error appears right after entering address/payment details or at the final checkout step, it can indicate a Pearson VUE account issue (for example, a block after failed payments). In that case, contact Pearson VUE support directly using the link on the Certification Support page so they can check and remove any account block:
   • Go to https://aka.ms/CertificationSupport (this redirects to the Microsoft Credentials support experience, which includes Pearson VUE contact links).
2. If the error occurs before payment (or when using a voucher/discount) and persists across browsers or devices, open a ticket with Microsoft Credentials support so they can review the certification profile and the specific exam booking:
   • Use the Credentials support workflow described here: https://aka.ms/credentialssupport (sign in, complete the profile once, then reopen the link and submit a ticket under Product Family: Learning / Service: Microsoft Credential).
3. If the error is specifically “ERROR_VUE_WIDE_BLOCK” (sometimes shown in logs or detailed messages), this is explicitly documented as a Pearson VUE account block. The resolution in that case is only via Pearson VUE support (again via the Certification Support link above).

Because this is a back‑end booking error, local troubleshooting (clearing cache, different browser) usually is not sufficient; the support teams need to adjust the Pearson VUE or Microsoft certification account.

References:

• Exam schedule error - Microsoft Q&A
• I am not able to register for sc200 exam. It;s showing unexpected error. - Microsoft Q&A
• How we get certification certificate after exam pass, didn't received from last 6 months - Microsoft Q&A
• An Important Update on Microsoft Training and Certification