PowerShell: Exception calling "Open" with "1" argument(s): "Connection has been unexpectedly closed"

# Load WinSCP .NET assembly
Add-Type -Path "C:\<concealed local path>\WinSCPnet.dll"
 
# Set up session options
$sessionOptions = New-Object WinSCP.SessionOptions -Property @{
    Protocol = [WinSCP.Protocol]::Sftp
    HostName = "<concealed hostname>"
    UserName = "<concealed username>"
    Password = "<concealed password>"
    SshHostKeyFingerprint = "ssh-rsa 3072 <concealed fingerprint>"
}
 
$session = New-Object WinSCP.Session
 
try
{
    # Connect
    $session.Open($sessionOptions)
 
    # Transfer files
    $session.GetFiles("/*", "\\<concealed UNC path>\*").Check()
}
finally
{
    $session.Dispose()
}