As described in a blog post, users who opt for the extra layer of security can either “use authentication apps that support the TOTP (Time-Based One-Time Password) protocol (such as Google Authenticator, Microsoft Authenticator, and FreeOTP)” or have Zoom send you a code “by SMS or phone call”.
To enable the extra layer of security, log into Zoom’s website, go to My Account and click the Profile tab. If you scroll down you will see a section where you can “enable” two-factor authentication.
Administrators running multiple Zoom accounts for their organizations can also enable two-factor authentication. Zoom has posted the steps on his blog and on a support page.
Zoom used to allow two-factor authentication through apps like Google Authenticator, but as The Verge notes, it was only for signing in to the web and not its mobile or desktop apps.
The addition of two-factor authentication is that. The company earlier this year to encrypt his chats.