I try to register for MS exam, after I have provided my personal details I pressed Continue button and got to the discount section. There I entered my work email (that should guarantee me a discount) and pressed Check Eligibility. Then I got a popup and pressed Agree for linking accounts. Then MS forces me to log in again, I try to log in with my personal account and I get this error:
Message: AADSTS50020: User account X from identity provider 'live.com' does not exist in tenant 'Microsoft Services' and cannot access the application 'Y' (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.
Could somebody point me what is the problem? What does it mean?