Does Azure AD B2C support multiple user pools within the directory?

Question

I'm creating a multi tenant application where each user email address can exist independently in one or more tenants.

So [email protected] can register for both TenantA.com and register again for TenantB.com. He will exist twice as 2 separate entities.

AWS supports this concept though multiple User Pools per account

Auth0 supports this concept though multiple Connections per account

Does Azure AD B2C have a comparable offering, and if so where is it documented. There seem to be a number of workarounds available, but I've been unable to find any documentation to support this scenario directly.

Answer 1

You can use Custom Policies and add multiple B2C tenants as Azure AD external Identity Providers so that a user can select which tenant they want to login. Each B2C tenant would host a local user with the shared email.