Explanation:

According to the official Microsoft Identity and Access Administrator (SC-300) Study Guide and Microsoft Learn documentation ("Manage External Identities in Microsoft Entra ID") , External Identities in Microsoft Entra ID allow organizations to collaborate securely with users outside the organization using features like B2B collaboration and B2C self-service sign-up.
Let's analyze the two required configurations:
* B2B Collaboration: The External collaboration settings page is where administrators configure how external users (guests) interact with internal resources. This includes settings for guest user invitations, collaboration restrictions, redemption policies, and access permissions for B2B users. Microsoft documentation clearly states:
"Use External collaboration settings to manage the behavior and restrictions of B2B collaboration users in your directory." Therefore, to enable or adjust B2B collaboration, you must configure External collaboration settings.
* Monthly Active Users (MAU)-based pricing: Microsoft Entra External Identities pricing is based on Monthly Active Users (MAU), which must be linked to an Azure subscription for billing purposes. This configuration is found under Linked subscriptions. Microsoft's documentation explains:
"To enable MAU-based billing for your External Identities, you must link your Microsoft Entra tenant to an Azure subscription under the 'Linked subscriptions' option." Linking the subscription allows Microsoft to bill based on the number of active external users each month, aligning with the MAU pricing model.
Therefore:
* B2B collaboration # External collaboration settings
* MAU-based pricing # Linked subscriptions