In recent versions of iOS under the notification settings for each app, there is an option to "deliver notifications quietly".
When turned on: These notifications appear in the Notification Center, but don't show up on the lock screen, play sounds, or show a banner or badge icon.
Note that if you click on "Turn Off" you will turn off all notifications for that app and they won't even show in the notification center.
If a guest is complaining of notifications not showing in the lock screen or badges on the app icon from their homepage, please check this setting at the app level.
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