This article will outline how to unlink a controller from your account. This is important if you wish you resell your controller or want to transfer ownership to someone else. This prevents the next user from getting the error message that the serial number they are trying to link to their account is already in use.
To unlink a controller, follow the steps below:
From your browser, go to the top right of your dashboard and click on Settings. From your smartphone app, click on More. Then click on Configuration.
On the next screen, locate your serial number. Then click Remove serial.