Overview: B2B collaboration with external guests for your workforce

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Applies to: Green circle with a white check mark symbol. Workforce tenants White circle with a gray X symbol. External tenants (learn more)

Microsoft Entra External ID includes collaboration capabilities that allow your workforce to work securely with business partners and guests. In your workforce tenant, you can use B2B collaboration to share your company's applications and services with guests, while maintaining control over your own corporate data. Work securely with external partners, even if they don't have Microsoft Entra ID or an IT department.

Diagram illustrating B2B collaboration.

A simple invitation and redemption process lets partners use their own credentials to access your company's resources. Once the guest redeems their invitation or completes sign-up, they're represented in your directory as a user object. The user type for these B2B collaboration users is typically set to "guest" and their user principal name contains the #EXT# identifier.

Developers can use Microsoft Entra business-to-business APIs to customize the invitation process or write applications. For licensing and pricing information related to guest users, refer to Microsoft Entra External ID pricing.

Collaborate with any partner using their identities

With Microsoft Entra B2B, the partner uses their own identity management solution, so there's no external administrative overhead for your organization. Guest users sign in to your apps and services with their own work, school, or social identities.

  • The partner uses their own identities and credentials, whether or not they have a Microsoft Entra account.
  • You don't need to manage external accounts or passwords.
  • You don't need to sync accounts or manage account lifecycles.

Manage B2B collaboration with other organizations

B2B collaboration is enabled by default, but comprehensive admin settings let you control your inbound and outbound B2B collaboration with external partners and organizations.

  • Cross-tenant access settings. For B2B collaboration with other Microsoft Entra organizations, use cross-tenant access settings to control which users can authenticate with which resources. Manage inbound and outbound B2B collaboration, and scope access to specific users, groups, and applications. Set a default configuration that applies to all external organizations, and then create individual, organization-specific settings as needed. Using cross-tenant access settings, you can also trust multifactor (MFA) and device claims (compliant claims and Microsoft Entra hybrid joined claims) from other Microsoft Entra organizations.

  • External collaboration settings. Use external collaboration settings to define who can invite external users into your organization as guests. By default, all users in your organization, including B2B collaboration guest users, can invite external users to B2B collaboration. If you want to limit the ability to send invitations, you can turn invitations on or off for everyone, or limit invitations to certain roles. You can also allow or block B2B specific domains and set restrictions on guest user access to your directory.

These settings are used to manage two different aspects of B2B collaboration. Cross-tenant access settings control whether users can authenticate with external Microsoft Entra tenants. They apply to both inbound and outbound B2B collaboration. By contrast, external collaboration settings control which users in your organization are allowed to send B2B collaboration invitations to guests from any organization.

How cross-tenant access and external collaboration settings work together

When you're considering B2B collaboration with a specific external Microsoft Entra organization, determine whether your cross-tenant access settings allow B2B collaboration with that organization. Also consider whether your external collaboration settings allow your users to send invitations to that organization's domain. Here are some examples:

  • Example 1: You previously added adatum.com (a Microsoft Entra organization) to the list of blocked domains in your external collaboration settings, but your cross-tenant access settings enable B2B collaboration for all Microsoft Entra organizations. In this case, the most restrictive setting applies. Your external collaboration settings prevent your users from sending invitations to users at adatum.com.

  • Example 2: You allow B2B collaboration with Fabrikam in your cross-tenant access settings, but then you add fabrikam.com to your blocked domains in your external collaboration settings. Your users can't invite new Fabrikam business guests, but existing Fabrikam guests can continue using B2B collaboration.

For B2B collaboration end-users who perform cross-tenant sign-ins, their home tenant branding appears, even if there isn't custom branding specified. In the following example, the company branding for Woodgrove Groceries appears on the left. The example on the right displays the default branding for the user's home tenant.

Screenshots showing a comparison of the branded sign-in experience and the default sign-in experience.

Manage B2B collaboration with other Microsoft Clouds

Azure cloud services are available in separate national clouds, which are physically isolated instances of Azure. Increasingly, organizations are finding the need to collaborate with organizations and users across global cloud and national cloud boundaries. With Microsoft cloud settings, you can establish mutual B2B collaboration between the following Azure clouds:

To set up B2B collaboration between tenants in different clouds, both tenants configure their Microsoft cloud settings to enable collaboration with the other cloud. Then each tenant configures inbound and outbound cross-tenant access with the tenant in the other cloud. See Microsoft cloud settings for details.

Easily invite guest users from the Microsoft Entra admin center

As an administrator, you can easily add guest users to your organization in the admin center.

  • Create a new guest user in Microsoft Entra ID, similar to how you'd add a new user.
  • Assign guest users to apps or groups.
  • Send an invitation email that contains a redemption link, or send a direct link to an app you want to share.

Screenshot showing the Invite a new guest user invitation entry page.

  • Guest users follow a few simple redemption steps to sign in.

Screenshot showing the Review permissions page.

Use policies to securely share your apps and services

You can use authentication and authorization policies to protect your corporate content. Conditional Access policies, such as multifactor authentication, can be enforced:

  • At the tenant level
  • At the application level
  • For specific guest users to protect corporate apps and data

Screenshot showing the Conditional Access option.

Customize the onboarding experience for B2B guest users

Bring your external partners on board in ways customized to your organization's needs.

Next steps