turn on vibrate
How do I get my watch to vibrate for notifications
iMac 21.5″, macOS 10.15
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Where notifications appear
Notifications appear on your Apple Watch or iPhone, but not both.
If your iPhone is unlocked, you get notifications on your iPhone instead of your Apple Watch.
If your iPhone is locked or asleep, you get notifications on your Apple Watch, unless your Apple Watch is locked.
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 at the top of your watch face when you have unread notifications. If you want to hide the notification icon, open the Apple Watch app on your iPhone, tap Notifications, then turn off Notifications Indicator.
When you read or dismiss notifications on your Apple Watch, they’re also dismissed from your iPhone.
Having said that...
If you want to vibrate for specific notifications, such as text messages or emails, you can do so by going to the Notifications section in the Settings app and turning on Haptic Alerts for those specific apps.
Here are some additional tips for getting your Apple Watch to vibrate for notifications:
- Make sure that your Apple Watch is connected to your iPhone and that both devices are turned on.
- If you have your Apple Watch in silent mode, it will not vibrate for notifications. To turn off silent mode, press the Digital Crown on your Apple Watch and then tap the Silent button.
- You can also adjust the intensity of the haptic vibrations on your Apple Watch. To do this, go to Settings > Sounds & Haptics > Haptic Strength and then drag the slider to the desired intensity.