If you are targeting external users when developing with Power BI embedding, you have the flexibility to choose whichever identity provider you'd like to authenticate users and to manage user identity. Azure AD B2C provides a great option because it makes it possible to federate user accounts from popular identity providers such as Google, Twitter, LinkedIn, Facebook, Live.com and Azure AD. Azure AD B2C also provides rich self-service registration features including email verification and password reset which enables any user with a valid email address to seamlessly signup as a user.
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