Teams new and MTO (Multi Tenant Organization)

Microsoft is moving towards a new optimized collaboration and administration for organizations operating multiple M365 tenants. New Teams client is supporting this feature.

Nevertheless, there are (today in public preview) limitations to MTO, which might be removed over time.

  • Self-service of multitenant organization functionality is limited to a maximum of five tenants and 100,000 internal users per tenant. To request a raise in these limits, submit a Microsoft Entra ID or Microsoft 365 admin center support request.

Further to me, it is NOT a real multi-tenant organization, as we know from earlier days in AD, where we had "SubDomains", it is based on automated B2B identities, which are provisioned as B2B users automatically. This is the sync feature in MTO.

Below the extract from Microsoft blog release:

Using shared channels for seamless cross-tenant collaboration and communication

In a recent blog, we shared how Microsoft Teams Connect enables seamless and secure collaboration across organizational boundaries, such as multiple tenants, allowing everyone to work as one extended team while staying in their own Teams environment. Teams Connect shared channels allow you to chat, call, meet, and collaborate on files while staying in the flow of work, with no tenant switching required. Simply invite stakeholders to the shared channel, which then appears alongside the user’s list of channels. From there, all the channel’s members can collaborate, regardless of their tenant.

Shared channels do not require MTO configuration, but can be leveraged in multi-tenant organization scenarios for enhanced collaboration.


Getting started with MTO in Teams
To enable these MTO capabilities in Teams, admins will need to configure their MTO tenant in the Microsoft 365 admin center (now in public preview), which will perform a full sync of users across the tenants in the MTO group. Teams will automatically turn on the MTO features with no additional configuration or settings required to be managed in Teams.



MTO capabilities are now available to commercial users on the new Teams Windows, new Teams MacOS, iOS and Android client apps. A version of the Teams web app will also be optimized for these MTO features in the future.


For more information about MTO, visit our admin documentation and adoption pages below:
Plan for multi-tenant organizations in Microsoft 365 (Preview) - Microsoft 365 Enterprise | Microsof...
Shared channels in Microsoft Teams
Microsoft Mechanics: Shared channels in Microsoft Teams (YouTube)
Adopting the new Microsoft Teams


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