New message badge is missing on my Android OS

A: Concept has been changed according to the Ores OS concept. Notifications andbadge are corresponding each other. If you turn off 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 has been disabled. Whereas setting value of App icon badges is interlocked with notification panel  in O OS. In other words, if App notifications is disabled alarm will not alerted when new message is detected. Launch Settings app > Apps> select relevant application(messages etc.) > tap Notifications > tap Allow notification switch to activate it.