Number of notification is not appear on app icon
The numbers of notifications which is appear on the app icon is not show in my phone
iPhone 11, iOS 15
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Where you’ll see your notifications
Notifications go to either your Apple Watch or iPhone, but not both. Learn when a notification might appear on your iPhone, instead of your Apple Watch, below.
If your iPhone is unlocked, you'll get notifications on your iPhone instead of your Apple Watch.
If your iPhone is locked or asleep, you'll get notifications on your Apple Watch, unless your Apple Watch is locked with your passcode.
Some apps, such as the Noise app, are only on your Apple Watch. Notifications for these apps don't appear on your iPhone.
The red notification icon 
appears on your watch face when you get a notification. When you dismiss notifications on your Apple Watch, they’re also dismissed from your iPhone.