Entra External ID

Microsoft Entra External ID enables external identities to safely access business resources and consumer apps. It offers secure methods for collaborating with business partners and guests on internal apps and resources, as well as managing customer identity and access management (CIAM) for your consumer-facing applications.
For example, organizations can set up self-service registration for customers to sign-in to a web application using methods such as one-time passcodes, or social accounts from Google or Facebook.