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Html 5 Windows authentication box grayed out

sara2000 used Ask the Experts™
I am running a vCenter Server Appliance (VCSA) with Platform Services Controller (PSC) on 6.7 and it is successfully joined to my Active Directory domain.  I can successfully login to my vSphere Web Client(html5) using my AD credentials when I type them manually.  However,  the checkbox is grayed out to select the Use Windows session authentication box whether it is Chrome, IE and Edge. I am using Windows 10 PC .
How do I make the checkbox to work?
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There are many reasons why this does not work, Plugins, Browsers Permissions, Trusts, Certificates, DNS forward and reverse, it can be a nightmare to get working... (if it does not already work).


We have two vcenters on a separate site. I have no issue at one site. The bowser option grayed out for another site though all same version.