Video: TeamViewer 9 Features: Two Factor Authentication Setup
Two factor authentication: Setup. First download an authenticator app for your smartphone. To set up a two factor authentication for your account, log in to the TeamViewer Management Console and select the user's profile from the top right corner. Select "edit profile" and activate two factor authentication. Once you click "start activation" the wizard will present a QR code. Scan it with the app on your smartphone. The authenticator app will generate a unique security code. Just enter it on the next page of the wizard.
Don't forget to print your recovery code from the last step of the wizard, just in case. Now, whenever you log in to your TeamViewer account, TeamViewer will ask for a security code. Open the authentication app on your smartphone, and enter the shown security code. TeamViewer, control your computer the easy way..