Short answer
Two-factor authentication adds a second step when you sign in: a 6-digit code from an authenticator app (for example Google Authenticator, Microsoft Authenticator or 1Password). It protects both Nex and Nyx, because they share one account.
- Go to Settings → General → Two-Factor Authentication and tap Enable 2FA.
- Scan the QR code with your authenticator app.
- Enter the 6-digit code the app shows.
- Save your 8 backup codes somewhere safe, such as a password manager. They are shown only once. If you lose your phone, you can sign in with a backup code instead of the 6-digit code; each code works only once.
You can make new backup codes (Regenerate Codes) or turn it off (Disable 2FA) in the same place; both ask for your password.
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