CmdID

CmdID / PowerShell / Cmdlets / Get

Get-UserPrincipalNamesSuffix

Use the Get-UserPrincipalNamesSuffix cmdlet to view the user principal name (UPN) suffixes in the Active Directory forest. Exchange PowerShell reference

From the Exchange PowerShell reference 1 parameter Its page in the reference

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Parameters

1 in the Exchange PowerShell reference
-OrganizationalUnitThe OrganizationalUnit parameter filters the results based on the object's location in Active Directory.