When I installed Vmware SSO , the domain is grayed out, it has Vsphere.local, all it prompted me to type is the password then confirm password, so I proceeded in installing SSO, then Vcenter. during The install of Vcenter through the wizard,it also does not take the domain admin user name , I had to use the Default which is provided through the wizard which is email@example.com, well I typed a password then proceeded in installing Vcenter.
However after I installed Vsphere Client, the only way I can login through Vsphere client, is to use the user name Administrator@vsphere.local and password instead of my real domain name and password.
This is a Lab environment for Vsphere 5.5. I have not seen this issue with Vsphere 5.1.1 at work.
Any help will be very much appreciated.