AZ-900 registration blocked — “An input field is invalid” on Transfer to Pearson VUE page

Submit a Microsoft Credentials Support request because the error occurs on Microsoft’s Transfer to Pearson VUE form before the Pearson VUE handoff; neither this forum nor other users can inspect or repair your private candidate-profile linkage.

Submit the support request

1. Open Credentials support and select online support request.^1^
2. Configure the request as:
   • Product family: Learning
   • Product or Service: Microsoft Credentials
   • Category: the closest available option for certification exam registration or scheduling
   • Type of Support: Professional No Charge
   • Preferred contact: Email
3. Include:
   • Exam: AZ-900
   • Exact error: “An input field is invalid”
   • The page where it occurs: Transfer to Pearson VUE, before redirection
   • Your Learn Username, found in Learn profile settings
   • A screenshot showing the complete form and error, with sensitive values obscured
   • Approximate date, time, and time zone of the latest attempt
   • Confirmation that the issue reproduces across multiple browsers and computers
4. Ask support specifically to check:
   • Whether the correct Microsoft Learn profile is being used
   • Whether the certification candidate record is linked correctly
   • Which submitted field is failing validation
   • Whether the Microsoft-to-Pearson VUE handoff record must be repaired

Credentials Support works through email, even if a phone option is selected.^1^ Do not post your MCID, address, phone number, or other private candidate details in this public thread.

Profile checks before filing

Do not repeat browser troubleshooting; the cross-browser and cross-computer result already makes that path unproductive. Instead, check only the registration prerequisites:

1. Sign in to the intended Learn profile, preferably using the personal Microsoft account normally associated with your certification activity.
2. In Learn profile → Settings, verify that a legal name exists and matches the government-issued ID you will present for the exam.
3. Start registration from the AZ-900 exam page and choose Schedule with Pearson VUE.
4. On the transfer form, re-enter the requested address, phone number, and contact email.

Microsoft’s documented flow requires a legal name and then collects address, phone, and contact-email information before redirecting to Pearson VUE. Microsoft states that these transfer-form details are collected because Pearson VUE requires them and that Microsoft does not store them.^2^

If multiple Learn accounts may exist, verify that registration is being started from the intended profile. Microsoft documents that users can inadvertently use a different personal, work, or school account and recommends trying other accounts previously used for certification activity.^3^ Do not create another candidate profile as a workaround; ask Credentials Support to resolve the existing linkage.

When Pearson VUE should handle it instead

Contact Pearson VUE directly only if:

• You successfully reach Pearson VUE and then encounter an appointment or scheduling problem; official support guidance assigns those issues to the exam delivery partner.^1^
• The redirected URL contains ERROR_VUE_WIDE_BLOCK. That specific condition has been associated with a Pearson VUE account block, commonly after failed payments, and Pearson VUE must remove it.^4^

Without that URL marker—and because your failure occurs on the Microsoft transfer form—the supported escalation is Microsoft Credentials Support rather than asking Pearson VUE to schedule the exam manually.

References

1. Credentials support
2. Register and schedule an exam
3. Missing Exams or Certifications
4. How to schedule an exam ? - Microsoft Q&A