I posted this in another thread, but I am going to add my two cents here as well. For anyone dealing with this issue, Meraki and Umbrella were unable to provide a complete solution, due to whatsapp heavy integration with Facebook. Umbrella and Meraki can block the web and desktop app, but the mobile app continued to work. I had to use a layer 3 firewall rule to block the Facebook IP ranges associated with Whatsapp. You can find them here: https://developers.facebook.com/docs/whatsapp/guides/network-requirements/ under the IP addresses section. It was a complete pain to create 230 objects and 2 object groups (remember object groups only be 150 objects max) but I have successfully blocked whatsapp completely. I know that the ip addresses may change in the future, but that is something I will just have to deal with when it comes along.
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