We have contacted Whatsapp but we are not allowed to make a floating version.
Without cooperation from the original developer, we are not able to create floating version. This applies to Whatapps, Discord and other messengers and apps.
It's possible to float installed apps on Android 7 and newer thanks to Android's free-form mode. It's not possible to float installed apps on older Android devices. Please understand that it's not our fault but a limitation of Android platform and we can't do anything about it.
Please visit this link for more information: https://blog.floatingapps.net/2018/03/floating-whatsapp-and-clash-of-clans/