1. Restart your iPhone and check the app list on your Apple Watch again.
2. If the issue persists, ensure your Apple Watch is running watchOS 2.0 or later, as WeChat requires this version or higher.
To update:
- Open the Watch app on your iPhone.
- Tap「Watch」>「General」>「Software Update」.
- Update to the latest version of watchOS.
3. Restart your iPhone after updating and check your Apple Watch app list for WeChat.