In order to enable two-factor authentication (2FA) on your Nintendo account, you will need to follow these steps:

• Log in to your Nintendo account here.
• Select the “Sign-in and security settings” tab from the list on the left.
• Scroll down to the “2-Step Verification” section and click “Edit”.
• Click on the “2-Step Verification Setup” button.
• Enter your password and click “OK”.
• A QR code will appear for you to scan with the app of your choice.
• Enter the verification code from the authentication app and click “Submit”.

Congratulations! Your account is now protected with an additional security layer.