Glossary
Microsoft Entra External ID
By Emil Björk · Microsoft business apps consultant, Gothenburg
Microsoft's customer identity platform, successor to Azure AD B2C, for authenticating external users to Power Pages and Dynamics 365 resources.
Microsoft Entra External ID is Microsoft's customer identity platform — successor to Azure AD B2C — providing customer-grade authentication for external users accessing Power Pages portals, customer-facing Dynamics 365 apps, and any scenario where non-employee users need to sign in. External ID is hosted in a separate tenant from the workforce Entra ID directory, keeping customer accounts isolated from internal accounts. Supports email / password, social identity providers (Google, Facebook, Apple, LinkedIn), and federated identity from partner organisations. Features include branded sign-up / sign-in flows, MFA, custom attributes, password reset self-service, custom policies for complex scenarios. Billed per monthly active user (MAU). The right answer for any customer-facing portal in 2026+.