Message Badge not appearing in Oreo

A concept has been changed according to the Oreo OS concept. Notifications and badge are corresponding each other. If you turn off a app notification, you cannot see anything on app icon. With N OS, app icon is activated to notify a user when new alarm was detected although App notifications have been disabled. Whereas setting value of App icon badges is interlocked with notification panel in Oreo OS.

Please follow the steps listed below:

Navigate to Apps screen > Select relevant application (messages, etc.) > Tap Notifications > Tap Allow notification switch to activate it.

Pictorial representation of the above settings are as follows :