Powershell script that finds RDS Users. (I'm really close) But my variable for users has more than one, it wont work.

I had this question solved yesterday by Dustin Saunders, but I ran into one more detail that caused my script not to work.  

https://www.experts-exchange.com/questions/28978554/I-have-a-working-Powershell-Script-that-finds-RDUsers-but-I-need-to-add-an-exception-list-to-this-code.html

Here is the code that works if only "One" user logs on twice.

Import-Module remotedesktop

$ClientUser = get-rdusersession | Group-Object -Property UserName |Where-Object {$_.Count -gt 1} | select -ExpandProperty name
$exceptions = "drh","mdb","timh","jana"
$UserSessions = Get-RDUserSession -CollectionName TIMSV7 | Where-Object {$_.username -eq $ClientUser}

if ($UserSessions)
     {
     foreach ($UserSession in $UserSessions)
         {
            if ($exceptions -notcontains $($UserSession.username))
            {
                $UserSessionID = $UserSession.UnifiedSessionID
                $UserSessionHost = $UserSession.HostServer
               
                Invoke-RDUserLogoff -HostServer $UserSessionHost -UnifiedSessionID $UserSessionID -force
            }
         }
}

If you see Variable $ClientUser that is for the users that signed in twice.  Because I run this::

get-rdusersession | Group-Object -Property UserName |Where-Object {$_.Count -gt 1} | select -ExpandProperty name
I get this result for one user (Which the program works as it should)
RDST

But if it runs again, and there are more that one user that logged on twice, it wont work.  Example:
get-rdusersession | Group-Object -Property UserName |Where-Object {$_.Count -gt 1} | select -ExpandProperty name
And it comes up this
RDST
TIMSTEST


My script doesn't work.  I know it has something to do with my $UserSessions -eq $clientUser that suddenly had two.  I need help to resolve if multiple people end up in the $ClientUser.   Also the $Exemptions needs to work too.  This is so those users don't get logged off.   REALLY could use some help.