Pass Through Authentication Not Working - Help

Pass Through Authentication Not Working - Help

I have setup SDP 9.2 (9217) and this is working fine and can perform Import form Active Directory fine and Users can login fine.
Today i enabled Pass Through as this is a requirement by Management and i have followed all the guides and it sets up OK and creates the computer account using the scripts no problem but does not work.

I have rebooted the SDP server multiple times and configured local intranet settings in IE but whenever a user gets an email from SDP which contains a link to a ticket they click on that link and a login prompt appears.  I cannot get it to auto login using Pass Through.  I also reset the computer account etc.

Need help please.  I am using this SDP as a pilot to show Management what it can do but not good so far.
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