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 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 your browser cookies acceptance settings
In any case → 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 apparatus 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 "Manage equipment".If you go after clicking on "Continue on this device", there should only be one.