Text notifications not lighting up iPhone 13 locked screen

If your iPhone pairs to an Apple Watch, by design your paired iPhone does not chime when a new text arrives. Instead, Apple routes your alerts to your Apple Watch, especially when the iPhone is locked.

As of now, there is no option to play a sound alert on BOTH your Apple Watch and your iPhone at the same time. It’s one or the other, based on the locked status of your phone.

The rule of thumb is if your phone is unlocked, notifications go to the iPhone. If your phone is locked, notifications go to your watch.

1. If you turn off Wrist Detection (on your iPhone, in the Watch app, go to: My Watch > Passcode – turn off Wrist Detection), then all notifications and the notification sound will be delivered to both devices.
2. When you dismiss notifications on your Apple Watch, they’re also dismissed from your iPhone. You receive notifications on whichever device you’re using, not both devices at the same time.

Note: If you turn off Wrist Detection, you will then not be able to benefit from features including Apple Pay, earning Stand credit and a single unlock after placing your Apple Watch on your wrist.

Change notification settings on iPhone

1. Go to Settings > Notifications.
2. To schedule a notifications summary, tap Scheduled Summary, then turn on Scheduled Summary. ... 
3. To choose when you want most notification previews to appear, tap Show Previews, select an option—Always, When Unlocked, or Never—then tap.

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Change notification settings on iPhone - Apple Support

i have the same problem, since the past month, iPhone 12mini

Try turning of the Bluetooth, in the Settings. It worked for me, but really unhappy about that solution. It is inconceivable.

Go to this web site for all the list of possible solution.

https://zcom.tech/iphone-notification-not-working.html/

Same issue, iPhone10, iOS14. not a peep when locked. all settings checked. can anyone help?

actually, fixed after 3rd restart.....

Same problem in iOS 14.8

bit does not occur with all contacts.

Still no fix here. I have hard reset iPhone 12 with IOS 15.1 a few times, factory reset once, still no joy. Only thing that is a workaround is to turn off Bluetooth. That’s impractical.