You'll need to enable Two-Factor Authentication (2FA) before you can begin broadcasting on Twitch.
Open your Twitch security settings page then click on Enable Two-Factor Authentication
Enter your Twitch password.
Enter your mobile phone number.
Enter the verification code you received via text message/SMS or the Authy app if you're already an Authy user.
- You'll receive a confirmation message once 2FA has successfully been enabled.