Explanation:
Box 1: Cross-tenant synchronization
Cross-tenant synchronization automates creating, updating, and deleting Microsoft Entra B2B collaboration users across tenants in an organization. It enables users to access applications and collaborate across tenants, while still allowing the organization to evolve.
Here are the primary goals of cross-tenant synchronization:
Seamless collaboration for a multitenant organization
Automate lifecycle management of B2B collaboration users in a multitenant organization Automatically remove B2B accounts when a user leaves the organization Box 2: Entitlement management Provide policy-based management of access assignments, approvals, and expirations.
The best solution for policy-based management of access assignments, approvals, and expiration in Azure is Microsoft Entra ID Governance Entitlement Management (formerly Azure AD Entitlement Management).
Entitlement Management enables organizations to manage the lifecycle of access to groups, applications, and SharePoint sites for both internal and external users through a centralized, policy-driven approach.
Entitlement management provides the most comprehensive, end-to-end automation for the specific requirements of policy-driven access assignments, approvals, and expiration.
Why Entitlement Management is Best:
Policy-Based Access: You can define policies that determine who can request access (e.g., all employees, specific external partners), the requestor information required, and approval workflows.
Approvals: It supports multi-stage approval workflows, allowing designated sponsors or managers to approve access requests.
Expiration: You can set access assignments to expire automatically on a specific date, after a set number of days, or never, forcing users to renew access if needed.
Lifecycle Management: It automates access requests, assignments, and reviews (recertification).
Access Packages: By grouping resources into "Access Packages," you can apply a single policy to govern the entire access lifecycle for that package.
Reference:
https://learn.microsoft.com/en-us/entra/identity/multi-tenant-organizations/cross-tenant-synchronization-overview
https://learn.microsoft.com/en-us/entra/id-governance/entitlement-management-overview