В ноте ведь сказано, что либо так, либо никак.

note
Some customers are not happy with this functionality. They would expect that if XYZ has a
previously established session, when he or she wants to log in from another computer, the login
screen should send a message type “sorry, you already have an open session”. However, given
the nature of HTTP, this is not possible due to the following reasons:

- Browsers can crash, leaving the existing session open and the user without any chance to log in
- Users close the browser window instead of logging off as intended
- Computers can crash

An enhancement to this behavior can be considered in the future, however it is unlikely that could
be approved.