Making Email Optional in Microsoft Entra External ID: Why This Matters for Modern CIAM
In customer identity, flexibility isn’t just a convenience it’s a requirement. As organizations expand globally and integrate with diverse identity providers, the assumption that every user has (or wants to provide) an email address is increasingly outdated. Microsoft Entra External ID now supports a small but powerful capability: making the email attribute optional during sign‑up when users authenticate through a federated external OIDC provider . This change helps organizations deliver more inclusive onboarding experiences while maintaining strong identity assurance. Why Email Became a Bottleneck By default, Entra External ID expects an email claim during sign‑up. When an external IdP doesn’t provide one, users hit the error: “AADSTS901011: No email address was obtained from the external OIDC identity provider during sign-up.” This is common with: Government or national digital identity systems Enterprise IdPs that rely on employee numbers or unique subject ...