I have a native React application. I use Firebase on my server side to send push notifications. It works without any problem, I get my notification on my application taking into account the state of my app (foreground, background, quit). On Android, I manage to get a +1 icon on my application icon, which is called the Icon badge. But on IOS this is impossible.

I’ve tried to implement the explanations provided in the documentation here. The BackgroundMessageHandler event never fires on ios, which prevents me from adding a +1 icon to my app, regardless of its state, when I receive a notification.
I’ve also tried using another package from the community but nothing works. Package