Can’t get whatsapp notification on apple watch

Hello Lilian1997,

Thank you for reaching out to Apple Support Communities.

These steps should help:

"Customize your notification settings

1. Open the Apple Watch app on your iPhone, then tap the My Watch tab. 
2. Tap Notifications. 
3. Tap an app. Different apps have different options. To use the same notification settings on your Apple Watch and iPhone, tap Mirror my iPhone. Some apps allow you to customize your notifications. When you customize, you can choose from these options:

• Allow Notifications: Notifications appear in Notification Center and your Apple Watch alerts you. 
• Send to Notification Center: Notifications are sent directly to Notification Center without your Apple Watch alerting you.
• Notifications Off: The app sends no notifications.

4. If you customize an app's notifications, you can also group notifications from that app. Tap Notification grouping, then choose an option: Off, Automatically, or By app.

If you can't customize an app, you can still turn off its notifications. Scroll down to the Mirror iPhone Alerts From section and turn off the setting next to the app. 

Learn how to change audio settings for notifications. "

More information can be found here: Notifications on your Apple Watch

Essentially you want to go to Settings > Notifications > WhatsApp and choosing your notification settings. You want to switch on Show In Notification Centre and Show in Lock Screen.

Then, go to Watch app on your iPhone and tap on Notifications. Scroll down to the Mirror Alerts From section and you should see WhatsApp right at the bottom. Make sure its toggle switch is on.

Hopefully this helps.

Cheers!