VNC Connect does support multi-factor authentication, to protect your account, your computers and your data wherever you are.
Note that VNC Connect has two separate password systems, so no one credential controls remote access to your computers. You can protect both systems with two or more factors.
RealVNC account password
We strongly recommend you set up 2-step verification for your RealVNC account. To do this, see How do I set up 2-step authentication for my RealVNC account
VNC Server password
You can set up multiple authentication schemes for the computers you want to control, for example using single sign-on (SSO) or X.509 certificate authentication. For more information, start with this article.