The script works well when run in PowerShell ISE but does not work through Task Scheduler

param (
    $localPath = "\\LocalUNCPath\*",
    $remotePath = "/remotepath/",
    $backupPath = "\\LocalUNCbackupPath"
)
 
try
{
    # Load WinSCP .NET assembly
    Add-Type -Path "C:\Program Files (x86)\WinSCP\WinSCPnet.dll"
    # Setup session options
    $sessionOptions = New-Object WinSCP.SessionOptions -Property @{
        Protocol = [WinSCP.Protocol]::Sftp
        HostName = "hostname"
        UserName = "userid"
        Password = "password"
        SshHostKeyFingerprint = "ssh-rsa key"
    }
 
    $session = New-Object WinSCP.Session
    $DateTime = Get-Date -format dd-MM-yyyy
    $session.SessionLogPath = "C:\LogDir\Sessionlog$DateTime.log"
    try
    {
        # Connect
        $session.Open($sessionOptions)
 
        $transferOptions = New-Object WinSCP.TransferOptions
        $transferOptions.FileMask = "|*/"
        $transferOptions.FilePermissions = $Null
        $transferOptions.PreserveTimestamp = $false;
 
        # Upload files, collect results
        $transferResult = $session.PutFiles($localPath, $remotePath, $false, $transferOptions)
        # Iterate over every transfer
        foreach ($transfer in $transferResult.Transfers)
        {
            # Success or error?
            if ($transfer.Error -eq $Null)
            {
                Write-Host "Upload of $($transfer.FileName) succeeded, moving to backup"
                # Upload succeeded, move source file to backup
                Move-Item $transfer.FileName $backupPath
                Send-MailMessage -To “<EmailID>" -From “<EmailID>" -SMTPServer smtpServerName -Subject “Upload of $($transfer.FileName) Successful - $env:COMPUTERNAME” -Body “Upload of $($transfer.FileName) Successful: $env:COMPUTERNAME”
            }
            else
            {
                Write-Host "Upload of $($transfer.FileName) failed: $($transfer.Error.Message)"
                Send-MailMessage -To “<EmailID>" -From “<EmailID>" -SMTPServer smtpServerName -Subject “Upload of $($transfer.FileName) failed - $env:COMPUTERNAME” -Body “Upload of $($transfer.FileName) failed: $env:COMPUTERNAME $($transfer.Error.Message)”
            }
        }
    }
    finally
    {
        # Disconnect, clean up
        $session.Dispose()
    }
 
    exit 0
}
catch
{
    Write-Host "Error: $($_.Exception.Message)"
    exit 1
}

PS D:\YH SFTP\TEST_Staging> D:\YH SFTP\TEST_Staging\1_To_Staging_Final_22_OCT_2020_Ver_2.ps1
Upload of D:\TEST_STAGING\Staging_Send_TO_\3_22_OCT_2020.txt succeeded, moving to backup

-Command  "start-process -verb runAs "powershell " -argumentlist "D:\YH SFTP\TEST_Staging\1_To_Staging_Final_22_OCT_2020_Ver_2.ps1"