Our ArcGIS Enterprise 10.5.1 is connected to Active Directory for authentication.
When we login to ArcGIS Server Manager, we login as: domain\user
When we login to ArcGIS Sever Admin, we login as: domain\user
When we login to Portal for ArcGIS, we login as domain\user
Please make this either consistent (the same everywhere) or flexible so that either syntax works on all pages.