Another option for enabling Two-Step Verification is to purchase a USB security key. These are plugged into an available USB port on your computer, and work with an authenticator program to generate codes for logging into your seller account.
Some examples of USB security keys include Yubikeys and Nitrokeys, but you can search for others on the Internet. Make sure they all support TOTP-OATH (Time-based One-time Password Algorithm for the Initiative for Open Authentication).
Note: USB security keys and authenticator programs don't have access to your Seller Central password or account information.
USB security key setup
Follow these steps after you have installed the authenticator program that comes with your USB security key.
Log in to Seller Central and go to Settings > Login Settings.
Click the Edit button next to Advanced Security Settings, and then click the Get Started button.
Check Authenticator App when prompted to choose how you'll receive codes. A QR code will display on the screen.
Insert your USB security key into the USB drive on your computer.
Follow the instructions of your authenticator program to add your account name (email address) and the secret key, which is embedded in the QR code. Some have the capability to scan QR codes while others might require you to enter the secret key manually. If you can't scan the code, click Can’t scan the barcode? on the Two-Step Verification setup page.
After you add credentials to the authenticator program, it will automatically generate a random code for you to re-enter on the setup screen under the QR code.
Click Verify and continue.
Now when you insert the USB security key into your computer, a code will be sent to the authenticator program. You'll enter that code on the log in screen. The authenticator program will not generate codes until you insert the USB security key.