As part of Microsoft’s feature parity with Teams Phone extensibility, we’re announcing the enforcement of Phone System license checks for Bot-initiated transfers to Teams users. This current gap in our systems will be addressed in June 2025. 

Microsoft Teams requires that Teams users behind applications such as queue applications require a phone system license and the user to be Enterprise Voice Enabled. We’re aligning the Microsoft Graph API with that requirement.  

What is the change? Copy link

Effective June 2025: 

• Teams users will still have the option to transfer calls to other Teams users manually even if they don’t have a PSTN phone system license. 

• Bot-initiated transfers and add participant requests to non-phone system enabled users will be blocked.  

What do you need to do? Copy link

• Review and update any applications that use the transfer and add participant APIs to make sure that they account for the new default behavior.  

• If you currently rely on the absence of license checks, enforce and inform customers about the change in behavior so they don’t experience a service disruption.