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.
- In the Services Tab, delete the Teams service by clicking the 'Disable Sync' button.
- In the customer Microsoft 365 portal https://admin.microsoft.com/ delete the domains belonging to the service (there will be at least two).
- Complete the move to Teams Islands Mode:
- When the organisation has migrated to Teams Only Mode, then use the 'Enable Sync' function in the Teams tab in the portal.
Legacy domains, such as Lync or Skype for Business, are no longer supported on our platform.
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