Applies to

Call2Teams Customers

Review this article if the error "One or more Microsoft 365 domains have a public DNS record that points to an on-premises Skype for Business Server deployment." or "We can't upgrade this organization to Teams Only mode"  is encountered during the upgrade to Teams Only mode.


Historically Islands mode supported Microsoft Teams Direct Routing. Microsoft no longer supports Teams Direct Routing in Islands mode. It is not possible to migrate an account to Teams only mode with the service activated since the domains will not reactivate for voice.

Phone System Direct Routing is not supported in Islands mode. 

Moving To Teams Only Mode

Customers who are using the service with Islands mode, and wish to move to Teams Only mode need to follow the following process:

Note: this process is service affecting an will result in the inability to make and receive calls through the connector whilst the move is taking place, Due to the occasional unpredictability of Microsoft's activation, this process may take some time so is best performed during an off-peak time where a change-window of several hours is available.
Keep a note of your user settings as you may need these later. Read this article thoroughly before taking any action.

The domains will be re-added to the tenant and provisioned for calling.

To change to Teams Only mode via Powershell

You can follow this link from Microsoft once the domains have been removed and Sync has been disabled:

You may have to wait 24 hours for Microsoft to recognize that the domains have been removed.

The following Grant command will work once the above criteria has been met:   Grant-CsTeamsUpgradePolicy -PolicyName UpgradeToTeams -Global


Legacy domains, such as Lync or Skype for Business, are no longer supported on our platform.


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