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I am currently the admin for an AAD B2C tenant (I can add B2C applications, flows/policies, etc.) but I can view only some AAD stuff. I understand that AAD B2C is a different service that is somewhat under our organization's AAD umbrella, but I don't have access to the AAD configuration.

I noticed that all the AAD B2C users are also shown as AAD users, and any new B2C app automatically appears in the App Registrations on the leftmost blade in the Azure portal.

All these make me think that AAD B2C uses AAD underneath. This is indirectly confirmed by the existence of a special application registered with the AAD (named "b2c-extensions-app. Do not modify. Used by AADB2C for storing user data."), which serves as a bridge between the two.

Does anybody know any more details about this relationship? I searched a lot but couldn't find much about it.

Vic
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  • Azure AD B2C is a specific type of Azure AD, A different tenant. that's why it looks like your enterprise AAD but you can't see the AAD users from your enterprise tenant. – Thomas Jul 04 '19 at 20:51

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Azure AD B2C tenants (i.e. directories) are special-purpose Azure AD tenants with some features (and some limitations) specifically designed for B2C scenarios.

So yes, Azure AD B2C uses "regular" Azure AD for the core directory infrastructure, and adds all of the consumer-centric capabilities (sign-in/sign-up flows, Identity Experience Framework policies, full branding customization, etc.).

Philippe Signoret
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