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How to solve the problem that Apple 8pls receives a message without notice, display and sound?

Settings-Notifications-Information allows notifications to be turned on.

Reminder can set the lock screen and banner.

Set the sound below and select the ringtone. Do not set it to none.

If everything is set correctly, this may be a setup or system problem.

You can restore all settings or connect your computer to iTunes to back up data and then restore the system to solve it.