The "Logged in user" module only lists users logged onto the node as the user executing the module.
Release or Environment
Madrid Patch 3
The "Logged in user" module only lists users logged onto the same node the user who is executing the module. Users logged into any other node will not be visible with this module.
Out of box, there is no way of logging into a specific node because of load balancing in order to review all logged in users.