The Messenger icon on my home screen doesn't show messages.

The Messenger icon on the home screen used to show the little circle telling me I had messages. The Messages icon still does. At Settings-Notifications, Messenger is turned on just like Messages is. I need to see the Messenger number of messages too.

Messenger as in SMS? Or as in Facebook Messenger? If Facebook Messenger, contact Facebook at android-support@fb.com. If SMS, register an account here so you can continue the conversation here, instead of starting a new one every time you post and tell us what make and model phone, which version of Android it's running, and whether you've gotten any recent updates to the messenger app or to Android.