IFS application 10 UPD22 - IEE client

We are trying to limit the number of devices a userid can be logged into IFS at the same time.  We are working with Oracle Profile - Sessions / User.    

A value of UNLIMITED appears to allow an unlimited number of logins on multiple devices.

A value of 3 (or more) appears to allow an unlimited number of logins on multiple devices.

A value of 1, or 2, does not allow the userid to login, with the system responding with “invalid login credentials”.

Have others got this working?

The goal is to prevent sharing of accounts, requiring each user to log in with their own account.