When I try to link my account when trying to sign up to take the exam, I keep getting errors such as "Message: AADSTS51004: The user account s9xkO46bTEa15N98AOFjvQ== does not exist in the 8f6e73cf-1bf1-4fee-a9ee-552530acd8b0 directory. To sign into this application, the account must be added to the directory."
Even when I try to just use my personal account, I get "AADSTS50020: User account *** Email address is removed for privacy ***' from identity provider 'live.com' does not exist in tenant 'Microsoft Services' and cannot access the application 'b9c392b1-7049-4d6c-86bf-9bb91214900d'(Microsoft Learning Identity Service) in that tenant. The account needs to be added as an external user in the tenant first. Sign out and sign in again with a different Azure Active Directory user account.
I have tried IE, Chrome and Firefox, cleared my cache in all 3, and tried private browsing in all 3. None seem to work.
How can I sign up to take an exam?
***Moved from: Microsoft Certification / Exams / Exam Registration and Scheduling / Scheduling with Pearson Vue***