Hi there MonaEghtesadi,
You'll want to start by making sure your iPhone is fully updated to the latest software version, which is iOS 16.5.1. You can see what version is currently installed by going to Settings > General > About > Software Version. If needed, you can follow the steps in this support article to update your iPhone: Update your iPhone or iPad - Apple Support
Next, make sure all your apps are updated in the App Store with the steps below:
How to manually update apps on your iPhone or iPad
1. Open the App Store.
2. Tap your profile icon at the top of the screen.
3. Scroll to see pending updates and release notes. Tap Update next to an app to update only that app, or tap Update All.
You'll find those steps here: How to manually update apps on your Apple device - Apple Support
After you've ensured your iPhone and all your apps are up-to-date, let's check your notification settings to be sure you have them all turned on for when your iPhone is locked. Follow these steps:
Change notification settings
Most notification settings can be customized for each app. You can turn app notifications on or off, have notifications play a sound, choose how and where you want app notifications to appear when your device is unlocked, and more.
1. Go to Settings
> Notifications.
2. Choose how you want notifications displayed on the Lock Screen:
* View just the number of notifications: Tap Count.
* View the notifications grouped into stacks by app: Tap Stack.
* View the notifications in a list: Tap List.
6. When notifications arrive, you can change the layout by pinching the notifications on the Lock Screen.
7. To schedule a notification summary, tap Scheduled Summary, then turn on Scheduled Summary. (See schedule a notification summary.)
8. To choose when you want notification previews to appear, tap Show Previews, select an option—Always, When Unlocked, or Never—then tap
at the top left.
You'll find those steps and more information here: Change notification settings on iPhone - Apple Support
Let us know how it goes.
Cheers!