Hello Eriktadashi,
Thanks for your post to Apple Support Communities. We have some help for Notifications not working properly on your iPhone. Let's start with some basic steps that will often resolve this issue.
- Restart your iPhone
- Confirm your iOS is fully updated
- Go to Settings > General > Software Update
- Test a specific app (like Messages) with the following steps:
- Go to Settings > Notifications > Select the App
- Disable Lock Screen and Banners
- See if you get notifications for Messages
Once you've completed the steps, you can re enable Lock Screen and Banners settings as you had them previously. Reply back here with how it goes. Also let us know if the Notifications don't show when your iPhone is locked only or any time while using your device. We look forward to hearing back from you.
Warm regards.