Please follow these steps to activate 2FA on your account.
Log in to https://sso.coss.io/login , and go to your account page.
You should see a screen like this :
Click on the account link, and you would be taken to another page :
Do take note that you have to add in your phone number BEFORE a link appears for you to activate your 2FA.
Follow the instructions onscreen in the Two Factor Authentication section.
Once your 2FA has been enabled, the Two Factor Authentication section will look like this: