Microsoft Entra External ID
Microsoft's customer identity platform — successor to Azure AD B2C — for authenticating external users to Power Pages portals and customer-facing 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+.