How can I allow AD users to login to the service desk when working externally from the office.

Hi Glenn thanks for the response.   They aren't connected via VPN.  We were hoping that you could still go to the direct link and login using the account created by the SSO registration process.  Is this not the case?  Ideally users would be able to login on there phones or other devices while on the move without the need to first create a VPN connection.