Teams Cross Cloud Guest Access (CCGA) extends existing Guest Access functionality allowing a user to participate in rich collaboration experiences in teams, channels, documents and Teams meetings between tenants across Microsoft clouds. Guests are able to participate in a full collaboration experience including audio/video, screen share, file share and both 1:1 and 1: many chats. These features are enabled through the Azure Active Directory B2B feature and the newly released Cross Tenant Access Settings. When combined tenants can enable trusts between tenants and between Microsoft clouds.

This message is associated with Microsoft 365 Roadmap ID 145459.

When this will happen:

Standard Release: This feature will be available in late September 2023.

How this will affect your organization:

This change only impacts your organization if there are configured cross tenant access settings between tenants in different Microsoft clouds and Teams Guest Access is enabled. Once configured users will be able to invite new guests and add guests from another cloud to Teams using the same procedures they use today for guests in the same cloud.

Any compliance controls, identity governance or other management tooling used today to manage same cloud B2B Guests may need to be reviewed, updated or extended to include support for B2B guests from another Microsoft cloud. Azure Active Directory Identity Governance has already been updated to fully support management of B2B guest from other Microsoft clouds.

What you need to do to prepare:

If you are interested in using this feature, familiarize yourself with Azure Active Directory B2B, Cross Tenant Access Settings, Identity Governance and Teams Guest Access.

Client machines running Windows 10 must have KB5028166 installed.

Client machines running Windows 11 must have KB5028185 installed.

The following minimum client versions are required:

  • Windows Desktop Client: 1.6.00.4472
  • Mac Desktop Client: 1.6.00.4464
  • Android Client: 1416/1.0.0.2023121301
  • iOS Client: 5.12.0

Customers who apply strict firewall rules for access to M365 resources should review their existing rules to ensure communication with other Microsoft clouds has been enabled. IP address information for the various Microsoft clouds can be found here: Microsoft 365 endpoints – Microsoft 365 Enterprise | Microsoft Learn

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