CmdID

CmdID / PowerShell / Cmdlets / Add

Add-AdfsDeviceRegistrationUpnSuffix

Adds a custom UPN suffix. Windows Server PowerShell reference

From the Windows Server PowerShell reference 3 parameters Its page in the reference

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Parameters

3 in the Windows Server PowerShell reference
-UpnSuffixSpecifies a UPN suffix.
-Confirm, -cfPrompts you for confirmation before running the cmdlet.
-WhatIf, -wiShows what would happen if the cmdlet runs.