I have a user with a domain-joined laptop that is running Windows 10 Technical Preview. They are trying to create a new VPN connection and when it tries to connect, it seems to be passing the domain along with the user id and it is failing. We see this also from a new Windows 8.1 laptop that is domain-joined. Non-domain joined computers work fine (I am trying to set up a non-domain joined Windows 10 laptop to see if the same issue occurs).
Is there a “domain” or hostname that can be used as part of the login identity?