CmdID / PowerShell / Cmdlets / Set
Set-AdfsDeviceRegistrationUpnSuffix
Sets the list of UPN suffixes. Windows Server PowerShell reference
From the Windows Server PowerShell reference 3 parameters Its page in the reference
Parameters
-ForceForces the command to run without asking for user confirmation.-Confirm, -cfPrompts you for confirmation before running the cmdlet.-WhatIf, -wiShows what would happen if the cmdlet runs.