For example, if the number 2 is selected, the customer can be logged in with both their mobile phone browser and computer browser. If the customer now wants to log in with their tablet, it would not be possible, and the customer would have to log out from one of the devices.
SSO - What does the number of parallel logins per customer mean?
The number of parallel logins determines with how many devices the customer can be logged in with at the same time.