To do this:
- Go to your Company Settings.
- Under the General tab, locate the Two-Factor Authentication section (this is at the top of the first page that loads when you open Company Settings).
- Tick the option 'Two-Factor Authentication is a company wide rule'.
Once this has been done, any users who do not already have 2FA setup will be prompted to enable this when they next attempt to login. They will not be able to access their account until they have 2FA in place.