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I have everything set up from the article you posted except the Trusted Zones stuff and the Cert Thumbprints. Happy to post logs (ran out of time for now) Ideas would be greatly appreciated!!!! I'm certain it's something to do with (NULL)\DOMAIN\username. So has to be something the gateway is doing. It prompts the second time for direct auth to the session host as expected, and DOMAIN\username works.
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Clients can log into webaccess with their email address (account in DC).
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