B2B Setup between GCCHigh and Commercial Tenant - Teams Chat is not working as expected no presence

It has always been my understanding that B2B Direct connect is not supported between GCC High and commercial tenants due ITAR requirements.

https://learn.microsoft.com/en-us/entra/external-id/cross-tenant-access-overview#microsoft-cloud-settings

Hi @Nikhil Sinha,

Thank you for posting your question in the Microsoft Q&A forum.

For you receiving the best suggestion and guidance for this issue,  I highly suggest reaching out to Microsoft Support for deeper troubleshooting and resolution.  

A technical support engineer can perform a remote session to investigate the situation, verify the backend configurations, and run any necessary synchronization tools to resolve the problem. If the issue requires further attention, they can escalate it to a specialized team for deeper analysis.     

I sincerely recommend reaching out to your IT administrator to create a support ticket via Microsoft Admin Center > Support > Help & Support for further investigation. The backend team can review product design and service-level configurations to identify the root cause.   

Microsoft provides customer service phone numbers based on your region. You can find the appropriate contact number here: Customer service phone numbers - Microsoft Support  

As community moderators, I kindly ask for your understanding that our access to internal development details is limited, especially with GCC High and Commercial tenant. My primary role is to guide users toward the appropriate resources and support channels. While I may not have visibility into performing deeper backend analysis, we’ll continue doing our best to support you within the scope of our responsibilities.   

I hope this information is helpful. Should you have any questions or need further assistance, feel free to reach out at any time.  

Thank you for your patience and understanding. 

When dealing with B2B access between GCC High and a commercial tenant, there are specific considerations to ensure that Microsoft Teams chat functionality works as expected. Here are some steps and considerations to troubleshoot the issues you're experiencing:

1. Verify B2B Configuration: Ensure that the B2B settings are correctly configured to allow guest access and that the necessary permissions are granted for Teams chat functionality.
2. Check Guest User Presence: For guest users, presence information may not be displayed correctly due to configuration settings. Ensure that the guest access settings in both tenants allow for presence sharing.
3. Message Delivery Issues: If messages appear to be sent but are not delivered, this could indicate issues with the connectivity between the tenants or misconfigurations in the Teams settings. Check the Teams Admin Center for any alerts or issues related to message delivery.
4. Email Notifications Instead of Messages: Receiving email notifications instead of messages in Teams can occur if the Teams service cannot deliver the message directly to the user. This can happen due to restrictions on the guest account or connectivity issues.
5. Run Connectivity Tests: Utilize the Microsoft Remote Connectivity Analyzer tool to run tests related to Teams presence and chat functionality. This can help identify any underlying connectivity issues that may be affecting the B2B communication.
6. Consult Documentation: Review the official Microsoft documentation regarding Teams and Exchange interactions, especially for B2B scenarios, to ensure all configurations align with best practices and supported configurations.

If these steps do not resolve the issue, consider reaching out to Microsoft support for further assistance, providing them with detailed information about your configuration and the specific issues encountered.

References:

• How Exchange and Microsoft Teams interact
• Resolve interaction issues between Teams and Exchange Server