Logging in and creating users in Azure B2C

Order to create a solution (in the form of code + demo app).

Brief description of the requirements from the point of view of the application:

-a multi-tenant application for multiple companies (one of the claims must be the tenantId stored in the application database),

- users, their id, etc. must be exclusively in Azure B2C (possibly an email list in a separate database)

From the IdentityProvider's point of view:

- there needs to be functionality for the administrator to add (or invite) new users, with a choice of whether the Identity Provider is Google, a Microsoft account or an organization's Azure AD account (the user's email is always required).

-the main feature is that registering new users from within the application should be disabled and done via a migration script or email invitations (for discussion)