Connect connect embedded via RDP over SSL

We have a few servers where we have enabled SSL as the encryption method. While I can connect with no issue using the normal RDP client or opening an external session from Remote Desktop Manager, it will not allow me to open the session embedded. I receive the error message: "The remote computer requires that authentication be enabled to connect. Remote computer: computer.domain.com The connection cannot proceed because authentication is not enabled." All of the required certificates are in places and as stated above, this works with an external session. Any ideas why it does not work embedded? Thank you.