There is no 'WhatsApp' web application in the 'Web Applications' list and neither is it in the list of applications controlled by the Site Review team.

The URLs associated with the WhatsApp application which should be blocked to deny access to the application on a browser are the following:

1. cdn.whatsapp.net
2. snr.whatsapp.net
3. whatsapp.com
4. whatsapp.net

Note: If you are logged into the WhatsApp web application, you must either log out of or close the application in order for the policy to take effect.