Microsoft Teams - Unassigned Numbers
Back in the days of Skype for Business Onpremises this was a default feature that was being used for announcements of old number ranges and severeral other cases like people leaving the company and reroute phone calls to reception.
For this new feature in Microsoft Teams you will need to have the PowerShell Microsoft Teams module version 2.5.1 or higher.
In this article about the Microsoft Teams PowerShell module you can check your version and method to upgrade.
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