Sometimes, the GUI method of accomplishing tasks is too arduous and error prone. Thus, these quick cmdlets would get the job done in matter of seconds, assuming that WinRM and firewall allows the jump host to reach its targets.

# addLocalGroupMemberOnServerList.ps1

$computernames=@(
	'testserver1',
    'testserver2'
)

$localAdmins=@(
    'domain\backupadmin'
)

$remoteDesktopUsers=@(
    'domain\testuser'
)

invoke-command -computername $computernames -scriptblock{
		param($localAdmins,$remoteDesktopUsers)
		$localAdmins=$localAdmins.ToArray() # converting ArrayList datatype to Array [of objects]
		$remoteDesktopUsers=$remoteDesktopUsers.ToArray()
		try{
			$remoteDesktopUsers|%{add-localgroupmember -group 'Remote Desktop Users' -Member $_}
			$localAdmins|%{add-localgroupmember -group 'Administrators' -Member $_}
			return $true
		}catch{
			write-warning $_
			return $false
		}
	} -Args (,$localAdmins),(,$remoteDesktopUsers)

# Use legacy cmdlets to preemt this error
# Failed to compare two elements in the array.
#     + CategoryInfo          : NotSpecified: (:) [Get-LocalGroupMember], InvalidOperationException
#     + FullyQualifiedErrorId : An unspecified error occurred.,Microsoft.PowerShell.Commands.GetLocalGroupMemberCommand
#     + PSComputerName        : testserver.kimconnect.com
invoke-command -computername $computernames {net localgroup 'Administrators'; net localgroup 'Remote Desktop Users'}
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