Cross-tenant access with Azure AD External Identities
Azure AD (Active Directory) is a cloud-based identity and access management service in Microsoft Azure. It helps you manage the identities of users and devices while controlling access to resources within and outside your organization. A main Azure AD feature is support for integrated cross-tenant collaboration, enabling users from different organizations to collaborate and share resources with each other even when they're not part of the same Azure AD tenant (or instance).
This article shows how to use cross-tenant access settings to manage B2B collaboration and B2B direct connect with external Azure AD organizations — even across clouds. Read the blog for a walkthrough of managing external access with inbound and outbound settings, default settings, organizational settings and others. In addiiton, get tips for comparing settings for different scenarios.
What is cross-tenant access in Microsoft Entra External ID?
Cross-tenant access in Microsoft Entra External ID allows organizations to manage collaboration with other Microsoft Entra organizations and Microsoft Azure clouds. It provides settings for B2B collaboration and direct connect, enabling granular control over inbound and outbound access. This means organizations can trust multifactor authentication (MFA) and device claims from external organizations, facilitating smoother collaboration.
How do inbound and outbound access settings work?
Inbound access settings control whether users from external Microsoft Entra organizations can access resources in your organization, while outbound access settings determine if your users can access resources in external organizations. These settings can be applied to everyone or specified for individual users, groups, and applications, allowing for tailored access management.
What are the default settings for B2B collaboration?
By default, B2B collaboration is enabled for all internal users, allowing them to invite external guests. However, B2B direct connect is blocked by default, meaning no trust relationships are established for direct connections with external organizations. Organizations can modify these default settings to better suit their collaboration needs.

Cross-tenant access with Azure AD External Identities
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