In the ProjectWise Admin module, there is a column for "Last Login Date", and some Admins claim there is no entry for their Users, and yet they know those Users have been logged in.

The reason the entry is not there is that the setting in the Audit Trail has not been set for tracking User logins.  Some are not aware that the  ProjectWise Admin module > Right click > Properties > Audit Trail Tab > Scroll to "Users" enable "Log User Logins".