Once you sign in and consent, you should see TokenEncryption API in your Enterprise Apps. You will then be able to register your own client applications (recipients of encrypted tokens), set their API Permission to access the Token Encryption API with decrypt application permission, and use client credentials to request a token.
This sample uses a custom web service (B2BOBOWeb) to provide a token endpoint, which handles the Extension Grant requests and communicates with B2C to respond with a valid response (access token). It uses a specific B2C tenant configured with custom journeys to handle this communication.
This sample configures an existing B2C tenant for use with Identity Experience Framework custom policies. It performs all tasks defined in the getting started document except creating a Facebook signing key required by some starter policies.
AAD multi-tenancy is ideal for medium-to-large enterprises who own and manage their own identity infrastructure. This sample is for small enterprises, usually without their own identity infrastructure. It provides support for an application that needs to group it's users into discrete groups, each representing an application tenant.
Premier Dev Consultant Marius Rochon shares an example of a PowerShell script to upload a set of B2C IEF policies to one or more B2C tenants.
Microservices is an architectural style that structures an application as a collection of loosely coupled services, which implement business capabilities. The microservice architecture enables the continuous delivery/deployment of large, complex applications. It also enables an organization to evolve its technology stack.