Why does the mobile phone have new information but no blue dot prompt?

Mobile phone information has no permission to set. Permission setting method is as follows:

1. Open the settings page of the mobile phone, find the notification and status bar items, and click to open the notification and status bar items.

2. Open the notification management, find the SMS item, and then open it.

3. Open the notification permission item and display it on the status bar, that is, it is set. The next time you receive new information, there will be a blue dot prompt.