Install-Module -Name MicrosoftTeams -RequiredVersion 5.6.0 New-CsInboundBlockedNumberPattern -Name "BlockNumber0416450519" -Enabled $True -Description "BlockAgent2" -Pattern "^\+?0416450519$" confirm blocked numbers added with this command Get-CsInboundBlockedNumberPattern PS C:\Windows\system32> Get-CsInboundBlockedNumberPattern Identity : BlockNumber0491842223 Name : BlockNumber0491842223 Enabled : True Description : BlockAgent1 Pattern : ^\+?0491842223$ Identity : BlockNumber0416450519 Name : BlockNumber0416450519 Enabled : True Description : BlockAgent2 Pattern : ^\+?0416450519$