Issue Signing In to Register for AZ-104 Exam

Based on the provided information, the most likely cause of the “Unexpected error” when registering for a Microsoft certification exam is an issue on the exam provider side (Pearson VUE) or with the certification/registration backend, not with the local browser or network.

For AZ-104 registration errors, the documented guidance is:

1. If the error text or code corresponds to ERROR_VUE_WIDE_BLOCK, this typically indicates that the Pearson VUE account is blocked (commonly after multiple failed payment attempts). In that case, the block must be removed by Pearson VUE support.
2. For any persistent registration or certification profile issues (including errors on the Microsoft Learn / certification registration pages), the supported path is to open a ticket with the Microsoft Credentials / Certification support team.

Actionable steps:

1. Go to the Microsoft Certification support entry point listed for exam and certification issues and open a support request so the Learn/Certification staff can check the profile and the registration backend for the AZ-104 exam.
2. If support identifies a Pearson VUE block (for example, ERROR_VUE_WIDE_BLOCK), contact Pearson VUE support using the Pearson VUE customer service or chat links referenced from the certification support page so they can unblock the account.

These teams have access to the necessary backend systems to investigate the “Unexpected error” and correct any account, payment, or registration blocks that browser troubleshooting cannot resolve.

References:

• Getting this error while registering for a Microsoft certification. - Microsoft Q&A
• AZ-104 Exam Completed but Certificate Not Visible in My Microsoft Account - Microsoft Q&A