Loging into Entra ID throws error

The error means the personal Microsoft account from live.com no longer exists as a user in that old client’s Entra ID tenant, so Azure Portal can’t sign in there with that account.

To resolve:

1. Switch to a different tenant that the account can access
   In the Azure Portal or Entra admin center sign-in page, use the tenant picker to select a different directory where the gmail.com account is actually a member. If necessary, sign out completely from all Microsoft accounts in the browser and sign back in, then choose the correct directory.
2. Remove or re-add the account in that tenant (admin required)
   If access to that old client tenant is still required, an administrator in the xxxxxx Corp. tenant must add the gmail.com account as a guest user:
   • Sign in to the Microsoft Entra admin center as at least a user administrator or higher.
   • Go to Entra ID > Users and verify whether the account exists. If not, add it as an external (guest) user and assign any required roles or app access.
3. Use the correct sign-in endpoint for the account type
   If using custom apps or tools, ensure the authority/endpoint matches the account type. For example, for personal Microsoft accounts or multi-tenant apps, use the appropriate sign-in URL instead of a tenant-specific one:
   • Multitenant apps: https://login.microsoftonline.com/organizations
   • Multitenant + personal accounts: https://login.microsoftonline.com/common
   • Personal accounts only: https://login.microsoftonline.com/consumers

If the account should no longer access that client’s tenant, simply ensure a different directory is selected when opening Azure Portal and ignore that old tenant.

References:

• Error AADSTS50020 - User account from identity provider does not exist in tenant
• Problems signing in to a Microsoft application