firebase cloud messaging testing on iphone 6S (ios, xcode, react native)

I'm trying to test FCM push notifications on an iOS (iPhone 6S). I've got this working a month ago, but now I do not get it to work.

I'm using React Native Firebase v.5.x.x. I've followed the initial setup guide, the setup guid for cloud messaging and the setup guide for notifications. I also followed this manual on the firebase docs to set up APN certificates.

Now, when I use the editor on the firebase console to send a notification, I do not get any response from my app. This is my react native code in my app.

    const run = async () => {
        const enabled = await firebase.messaging().hasPermission()
        console.log('firebase', enabled)
        if (enabled) {
            // user has permissions
            console.log(await firebase.messaging().getToken())
        } else {
            // user doesn't have permission
            try {
                await firebase.messaging().requestPermission();
            } catch (error) {
                // User has rejected permissions
            }
        }
    }

    useEffect(() => {
        run()
    }, [])

    firebase.notifications().onNotification((notification) => {
        console.log(notification)
    });

With this code, I ask for permission to receive push notifications. I see the permissions dialog when I open the app for the first time. I accept the notifications. I also get a console.log output with the FCM token (console.log(await firebase.messaging().getToken())). I use this token in the notification creator in the firebase console to send a test notification. But I do not receive anything, if the app is in background, foreground, closed, ... it doesn't matter.

I have created a provisioning profile and I've added this in xcode. In xcode, going to my project > signing & capabilities, I've added the capabilities 'background modes (remote notifications)' and 'push notifications'. At the signing component, I have added the provisioning profile. I have unchecked automatically manage signing.

It seems to me I've done all steps necessary to receive push notifications. I'm testing on a real devices (iphone 6s), not on a simulator, and I've got it working on another iphone (6s) before, so it should work.

Am I missing anything?