| Error Code | 50020 |
| Message | User account '{email}' from identity provider '{idp}' does not exist in tenant '{tenant}' and cannot access the application '{appId}'({appName}) 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. |
| Remediation | A user was sent to a tenanted endpoint, and signed into an AAD account that doesn't exist in your tenant. If this user should be a member of the tenant, they should be invited via the B2B system. See here for details: https://docs.microsoft.com/azure/active-directory/b2b/add-users-administrator |