Using a lookup from one CSV file to another CSV file errors with a name clash

Hi

I have a master CSV file created by querying the AD. I need to populate the "Team" attribute by doing a lookup using Name against  the Name Column any of 6 CSVs,  someone has prepared for me .  The problem is the data is inconsistent in the 6 CSV files so Name can hold either the Name or Username i.e. SAmAccountName or LoginName

Now my ps script works when the data is good. but I have around 30 exception cases whereby there is a mismatch .  To explain:

is in this line ( see the big code block below) 

   $userObject = $nameAndTeamCsvData | Where-Object {$_.Name -eq $masterUserName} 

The $_.Name is using the top level masterCSVData Name but I was hoping that it was using the$nameAndTeamCSVData.Name as in only within the scope of the Where-Object {} ..I guess I have misunderstood the syntax of what I had written.

. A quick a dirty fix would be rename this column in all of the 4 spreadsheets or trying to fix the code.....

# now update the empty team value for user object
$csvMasterData | ForEach-Object `
{
  $masterName = $_.Name 
  $masterUserName = $_.Username # to deal with exception cases 

  
   #force scope to as the properties in the outer with the same name should be out of scope
        
      # lookup the Name to see if we can extract the user's Team  
      $userObject = $nameAndTeamCsvData | Where-Object {$_.Name -eq $masterName }
   
       # deal with the situation where the name in the businesses spreadsheets is actually the Username (login name) in the master csv
       if ( $userObject -eq $null )
       {
           # lookup the username (loginname)  to see if we can extract the user's   Team
           # !!!!error occurs here with the $_.Name !!!!!
           $userObject = $nameAndTeamCsvData | Where-Object {$_.Name -eq $masterUserName}  
           if ( $userObject -eq $null )
           {     
              $_.Team = "UNKNOWN"
           }
           else
           {    
              # replace the mastercsv.Team with the one we have looked up
              $_.Team = $userObject.Team
           }
        } 
         else
        {  
         #  Name matches so   replace the mastercsv.Team with the one we have looked up
         $_.Team = $userObject.Team
        }

}

Daniel