Cannot receive FCM (Push Notification iOS) - ios

Question

I make app by React Native.
Few days ago,I was able to receive FCM. But now I cannot.
Client app permissions notification, I set Xcode(capability),firebase and Apple Developer(APNs setting).
And console.log tells me success.
But I cannot receive notification. Although few days ago I could.
Is this error in firebase??
I don't know cause, please help me m(_ _)m
=======environment==========
Xcode Version 11.3
"react-native-firebase": "^5.6.0"
"react-native": "0.61.5"
"firebase-admin": "^8.9.0"
=======addition========
Regenerating APNs and setting, I could receive notification.
But next day, I couldn't receive notification.
APNs is valid in only one day???

Answer 1

Most probably, in your Firebase console number of potential users are eligible for this campaign is 0 currently.
"Estimate based on approximately 0 users who are registered to receive notifications. Some targeted users will not see the message due to device inactivity. For recurring campaigns, estimate is for initial send only."
Possible solution:
1) If that's the case (0 users are registered)
--> Check if the fcmToken is received.
getFcmToken = async () => {
const fcmToken = await firebase.messaging().getToken();
if (fcmToken) {
console.log(fcmToken);
this.showAlert(‘Your Firebase Token is:’, fcmToken);
} else {
this.showAlert(‘Failed’, ‘No token received’);
}
}
2) If the number is not zero
--> Most probably your app is opened in foreground and the notification is not displayed.
--> Try to lock your iPhone screen and the notification will appear, else try to handle it which the app is in foreground
messageListener = async () => {
this.notificationListener = firebase.notifications().onNotification((notification) => {
const { title, body } = notification;
this.showAlert(title, body);
});
this.notificationOpenedListener = firebase.notifications().onNotificationOpened((notificationOpen) => {
const { title, body } = notificationOpen.notification;
this.showAlert(title, body);
});
const notificationOpen = await firebase.notifications().getInitialNotification();
if (notificationOpen) {
const { title, body } = notificationOpen.notification;
this.showAlert(title, body);
}
this.messageListener = firebase.messaging().onMessage((message) => {
console.log(JSON.stringify(message));
});
}
3) Check if the cert has expired (unlikely) since you mentioned that it's still working a few days back.