vSphere 6.5 Web Client sign in/SSO question from a complete novice

[nary4484]

We are moving our View environment from 6 to 7 and putting the new Horizon 7 is going on a new vCenter 6.5 Server Appliance.  This has been setup already by someone else and everything is working a-okay.  Question I have is when I sign in I have to use username@ourdomain.com where as in our vCenter Server 6.0 environment I can sign in with just username

Is this by design or is there some sort of SSO/sign in configuration I can work on to change this?

[dineshgoundar]

This behavior is dependent upon the way identify source is configured in VCSA. Have seen this normally happen when identity source is configured to use integrated windows authentication. This requires the VCSA and any external PSC's to be joined to the domain. Changing the identity source type to "Active Directory as an LDAP server" fixes it.

Here is a link to setting up identity source. https://dineshgoundar.net/2017/06/30/configure-identity-sources-in-vcenter/