Hello there @Mola29, welcome to the Community.
If you are only missing WhatsApp notifications on your Fitbit, it may be due to incorrect notification settings. To fix this, open the Fitbit app and go to the top left corner. Tap on your devices name and then scroll to find the notifications settings. Make sure that WhatsApp is enabled and that the notification settings are set to your desired preferences. If you are still having trouble, try restarting your Fitbit and your phone.
You can always take a look at this article to get more help: How do I get notifications from my phone on my Fitbit device?
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