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How to Collaborate Between a 21Vianet Tenant and a Global Microsoft 365 Tenant
Question details
Organizations need to understand if and how they can establish inter-tenant collaboration between a global Microsoft 365 tenant and a tenant operated by 21Vianet.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Administrators want to configure cross-cloud access for sharing OneDrive files, SharePoint sites, Teams chats, and calendars between global and 21Vianet Microsoft 365 environments.
- Observed behavior
- Users require confirmation on the availability and configuration methods for Microsoft Entra B2B and other cross-cloud collaboration tools to bridge the two distinct cloud environments.
Ensure you have Global Administrator privileges in both the Global Microsoft 365 tenant and the 21Vianet tenant before attempting to modify cross-tenant access settings.
Configure Microsoft Entra B2B Cross-Tenant Access
Use Microsoft Entra cross-tenant access settings to explicitly establish trust and enable B2B collaboration between different cloud environments.
Microsoft provides B2B collaboration capabilities that allow users in a global tenant and a 21Vianet tenant to work together. Because these exist in separate Microsoft cloud environments, you must configure cross-cloud settings to allow inbound and outbound B2B extranet access.
Sign in to the Microsoft Entra admin center as a Global Administrator.
Go to 'Identity' > 'External Identities' > 'Cross-tenant access settings' in the left-hand navigation pane.
Select the 'Microsoft cloud settings' tab to define the specific external cloud environments (such as Microsoft Azure operated by 21Vianet) you want to collaborate with.
Configure both inbound and outbound settings to allow calendar sharing, Teams messaging, and secure access to centralized file locations like SharePoint and OneDrive.
Consult Microsoft Support and Q&A
Reach out to Microsoft specialists to confirm the latest service limitations for 21Vianet before beginning a large-scale enterprise deployment.
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Frequently Asked Questions
What collaboration features are generally supported between Global and 21Vianet tenants?
While subject to change, supported features often include Microsoft Entra B2B collaboration, B2B extranet access, calendar sharing, centralized file locations (SharePoint/OneDrive), and instant messaging with audio/video conferencing via Teams.
Do I need administrator access in both tenants to set up cross-cloud collaboration?
Yes, Global Administrator access is required in both the Global Microsoft 365 tenant and the 21Vianet tenant to configure inbound and outbound trust policies in Microsoft Entra ID.
Why might some Teams features fail to work between these two tenants?
Because the 21Vianet tenant operates in an isolated data boundary in China, certain real-time communication protocols or shared channels may face restrictions. It is highly recommended to consult the official Microsoft cross-cloud documentation to verify exact feature availability.
