SFTP server drops my WinSCP PowerShell scripted connection

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michaelayres
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Mendocino College in Ukiah, California

SFTP server drops my WinSCP PowerShell scripted connection

Please don't lecture me, I wrote my first computer program almost 40 years ago in CS in undergrad college. PS is just another tool, not God's child, and I am new PS usder) I connect and upload files OK to the external SFTP site with WinSCP GUI. SFTP server does not use a password but authenticates with SSH key exchange, so I have no password parameter when using WinSCP in PowerShell script (below) error says:
Connection has been unexpectedly closed. Server sent command exit status 0.
Authentication log (see session log for details):
Using username "myusername".
Authentication failed.
Question 1) Whose log and where is it? Do I need to $it
Question 2) Any big errors in PS scrript?
here is PS code: (I call without parameters for now as it is single use at this time)
$SHA256     = 'ssh-ed25519 256 blabal.....................'
$MD5        = 'ssh-ed25519 256 c8:bf5:12:c:28:2d:16............'
$username   = 'myusername'
$site       = 'ftp.ftpsite.com'
 
function Send-Sftp {
  try
  {
    # Setup Session Options
    $sessionlog        = "C:\mendo\software\conexed_package\winscplog.txt"
    $SshPrivateKeyPath = "C:\mendo\software\conexed_package\PPKeys\Mendo-ConexED_private_key.ppk" 
    $skey           = C:\mendo\software\conexed_package\PPKeys\Mendo-ConexED_private_key.ppk
    $SessionOptions = New-Object WinSCP.SessionOptions
    $SessionOptions.Protocol = [WinSCP.Protocol]::Sftp
    $SessionOptions.HostName = "$site"
    $SessionOptions.UserName = "$Username"
    $SessionOptions.PassWord = "$pass"
    $SessionOptions.sshHostKeyFingerprint = "$SHA256"
    #$sessionOptions.executablepath = "C:\Program Files\WindowsPowerShell\Modules\winscp\5.13.8.0\bin"
    $source = "c:\mendo\software\conexed_package\mendocino.csv"
    $dest   = "/import/*.*"
 
    'In send-sftp; before opening session'
    $Session = New-Object WinSCP.Session
    try
    {
      $session.Connect
      $Session.open($SessionOptions)
      # upload files -------------------
      'In send-sftp; after opening session'
      $TransferOptions = New-Object WinSCP.TransferOptions
      $TransferOptions.TransferMode = [WinsSCP.TransferMode]::Binary
      $TransferResult = $Session.PutFiles("$Source", "$Dest". "False", 
      #is put file ok or do I need send>
      $TransferOptions)
      # Print Results -------------------   
      foreach ($Transfer in $TransferResult.Transfers)
      {
        Write-host -foregroundcolor green("Upload of {0} succeded" -f $Transfer.Filename)
      } 
    } 
    finally
    {
      # disconnect and clean up
      $Session.Dispose()
    }
    #exit 0
  }
  catch [exception]
  {
    write-host $_.Exception.message
    exit 1
  }
}

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