Same happening here, all my WhatsApp numbers are getting banned right after I activate my Facebook campaigns, all the Ads/Business Managers are in perfect condition without any type of restriction (I'm using an Anty-detect browser+Proxies), and I've been doing gambling ads since a couple of weeks already. It's just these last 2 days that I can't just run the ads again because of the WhatsApp accounts getting insta-banned. All the numbers I used were between 5-10 days old with some warm-up (Chats+Groups history+Profile info completed).
Does anyone know any tips or tricks to avoid getting these bans? I've been thinking about WhatsApp probably blacklisting the IMEI / MAC Adress / IP of my devices, but it's just a theory for now.