Go to Settings > Security & Compliance > Multi-factor Authentication
Click on the link Zoho Directory.
Enter your Company Name and Portal Name and click on CREATE ACCOUNT.
Now go to Security > Security Policies and click on Getting Started.
Open the Multi-Factor Authentication tab under Default policy and click Setup .

Go to Settings and choose Multi-factor Authentication below Security & Compliance.
Click on MANAGE.
Navigate to the tab Users. The users who have been newly added to your Lens organization will be listed as Not invited yet.
To add them to your Zoho Directory account, hover over the specified user and click the Send invitation button.
An invite mail will be sent to the user. Once the user clicks Confirm now and accepts the invitation, it will activate the MFA for that user.
If you are the Admin of the organization, you can reset the user's password by following the steps below.
A mail will be sent to the particular user containing the new password.
Once reset, the new password should be used for further logins.