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Hello @MajaDull, thanks for joining us, it's a pleasure for me to welcome you to the Fitbit Community!
At the moment, it's not possible for the Charge 2 to receive Whatsapp notifications from you iOS device, this function is only available for Android users. However, I understand this feature would be very helpful for many people, which is why I would like to encourage you to vote and comment on @Finckator suggested idea to implement this feature in a new update. This is truly the best way to make your voice heard.
I hope this can be helpful, if there's anything else you need assistance with, feel free to reply! 
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