Edge Lighting feature on Galaxy S8/S8+ from installed WhatsApp.
In case of some 3’rd party applications, you need to set related option within application by itself.
Please check the settings in WhatsApp as following steps:
WhatsApp -> Settings -> Notifications -> Popup notification
If current selection is "No popup“, please change to "Always show popup“
If you still have problem to get notification from Whatsapp after the above setting, please check
if "Whatsapp" is selected in Notifications of settings.
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