Capturing authentication info

It seems that the Connect-Swiss can accept PS credentials I do this:

$global:username = Read-Host "Username"

$global:password = Read-Host -AsSecureString "Password"

Write-Output ""

$global:creds = new-object -typename System.Management.Automation.PSCredential -argumentlist $username,$password

So I end up having $creds as a ps auth... It does not work. What am I missing?