CAS n ° 1: you (or another person) use more than $ this.View.Author.Devicelimit appliances and/or browsers at the same time → Disconnect yourself from the devices and/or browsers that you do not use
Case n ° 2: You browse in private mode → Disconnect yourself systematically before closing the browser window
Case n ° 3: You refuse connection cookies in your browser settings (or an update has changed your settings) → Change the cookies acceptance settings of your browser
In all cases → Click on "Continue on this device" solves the problem
What's going on if I click on "Continue on this device"? You can take advantage of your account on this device and all your other device will disconnected.You can always reconnect there, within the limit of $ This.View.Author.Devicelimit Appliaments.
How can I see connected devices? Go to your customer area then click on "Manage equipment".If you go after clicking on "Continue on this device", there should only be one.