When registering or re-registering AlterLock Gen1, Gen2 devices, the "Authentication Code" listed in the start guide is required. If you have lost the authentication code, please note the 6 to 8-digit device ID displayed as you proceed through the steps of the "Device Registration" screen, and confirm by entering the required information on this page. Furthermore, if there is no connection history with the registered email address, the authentication code will not be displayed. In that case, please contact us through the inquiry form with the following information: - Registered email address - Device ID - A screenshot of the receipt or order history proving the purchase of the AlterLock device