We take your account security seriously. For your protection, we implemented two-factor authentication for all of our customers and all customers' devices will need to be registered. You will be asked to register your device when you sign in from an unregistered device. To ensure it is you signing in, we will email you a 5-digit code. Please input the code to the app to register your device. You can then continue to use the device to login to your account as usual.