Hi there, @Rialison86. It's nice to see you around the Fitbit Communtiy Forums. Thanks for bringing this to my attention. I'm sorry to hear that your new Charge 5 is not receiving Whatsapp notifications. I understand your concern, I will do my best to help you with this!
Since you're setting up notifications, you'll need to receive a message from the app desired in order for your app to show it as option in your Fitbit notification's section. For example, tell someone to send a WhatsApp, then check your Fitbit app and you'll see that WhatsApp is already an option to be selected.
I'd recommend following the steps in the article: How do I get notifications from my phone on my Fitbit device?
I hope this clarifies your question and helps you to set up your notifications. Let me know if you need further help.
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