Greetings mushlih_31,
Here is an article about when notifications on your Apple Watch are expected, versus receiving them on your iPhone. Notifications on your Apple Watch However, that should only come in to play when you’re wearing your Apple Watch.
When you’re not wearing your Apple Watch, are you seeing the display light up showing your notifications or hearing it make a noise to indicate a notification has come in? Are you ever receiving notifications on your iPhone as you’d anticipate such as if your watch is charging or locked?
Let’s also make sure we’re covering the basics, because we don’t want to overlook those.
Restart both devices and test again
Restart your iPhone
Restart your Apple Watch
Make sure both devices are up to date
Update your iPhone or iPad
Update your Apple Watch
Thanks.