Here's some extra steps you can take.
1. Check WhatsApp notification settings: Open the WhatsApp app, go to "Settings" > "Notifications" and ensure that notifications are enabled for messages, groups, and calls.
2. Check iPhone notification settings: Go to "Settings" > "Notifications" > scroll down and find "WhatsApp." Ensure that "Allow Notifications" is toggled on, and configure the notification settings according to your preferences.
3. Check Do Not Disturb settings: Ensure that Do Not Disturb is not enabled, as this could be suppressing notifications. Go to "Settings" > "Do Not Disturb" and check the settings.
4. Check battery optimization settings: Go to "Settings" > "Battery" and check if your iPhone is in Low Power Mode. If it is, disable it as background app activity may be limited, affecting notifications.
5. Update WhatsApp: Go to the App Store, search for "WhatsApp," and check if there's an update available.
6. Reinstall WhatsApp: Consider deleting and reinstalling the WhatsApp app. Before doing this, make sure you back up your chat history to iCloud. After reinstalling the app, restore your chat history and check if notifications work properly.
Additionally, you can report the issue to WhatsApp support so they can investigate and address the problem in future updates.
CF