I am trying to pay for Azure 104 exams, i am experiencing an error screen

The “unexpected error” screen when entering the address during exam payment is typically caused by a block or an incomplete Microsoft account profile, not by the address itself.

Based on similar reported issues and resolutions:

1. Check for Pearson VUE account block
   • The error during certification exam scheduling/payment is often due to ERROR_VUE_WIDE_BLOCK, which occurs when Pearson VUE has blocked the account, usually after multiple failed payment attempts.
   • To resolve this, contact Pearson VUE support using the Certification Support path at https://aka.ms/CertificationSupport so they can review and remove the block on the account.
2. Ensure Microsoft account profile has a valid locale
   • Another known cause for address-related errors (“It’s not you, it’s us” / unexpected error when saving billing address) is a missing or invalid language/region (locale) on the Microsoft account profile.
   • Update the Microsoft account profile to include a valid language/region, then try entering the address again.
3. If the issue persists
   • If the error continues after confirming the Pearson VUE block is cleared and the profile locale is set, raise a support case through the Certification Support link (https://aka.ms/CertificationSupport) so support can check the specific account and transaction.

References:

• Exam schedule error - Microsoft Q&A
• Getting this error while registering for a Microsoft certification. - Microsoft Q&A
• can not update billing address - Microsoft Q&A