firebase react cloud messaging push notification [duplicate] - reactjs

Question

I was working on a project using Firebase cloud messaging react. I was sending this to my server, but it doesn't work. Surely I have tried, but I don't know what's wrong again.
Below is the code.
Here it sends a POST request to Firebase, and it should send a notification to the user.
async function sendNotification(id, userMessage) {
const headers = {
'Authorization': `key=${code}`,
'Content-Type': 'application/json'
}
const message = {
'to': `${id}`,
'content_available': true,
'apns_priority': 5,
'notification': {
body: `${userMessage}`
},
const url = 'https://fcm.googleapis.com/fcm/send'
//console.log(code)
await axios.post(url, message, {
headers: headers
})
}
const sendMessageToServer = async (e) => {
//e.preventDefault();
toggle()
const docRe = doc(database, "help", mailer);
const data = {
email: user.email,
user: newMessage,
}
//console.log(data, 'not clear')
setNewMessage('')
//console.log(data, newMessage, 'cleared')
setShow(false)
if(newMessage === '') {
}
else {
const docRef = doc(database, "users", mailer);
await updateDoc(docRe, {
msg: arrayUnion(data)
})
.then(() => {
async function p() {
const id = await getDoc(docRef)
//console.log(id.data())
sendNotification(id.data().notice, `Admin : ${data.user}`)
}
p()
})
}
Sometimes it sends to my localhost because I tested there, but it doesn't work on my Netlify app. Secondly, I noticed that it keeps generating the same token for each user, but that's not the issue, but if you can help in both I would be grateful.
export default function Dashboard() {
async function callToken() {
await getToken(messaging, {vapidKey: process.env.NOTIFICATION})
.then((code) => {
//console.log(code)
async function docRef() {
const dc = doc(database, "users", auth.currentUser.email);
await updateDoc(dc, {
notice: code
});
}
docRef()
})
}
async function requestPermission() {
await Notification.requestPermission()
.then((permission) => {
if (permission === 'granted') {
console.log('Notification permission granted.')
callToken()
}
})
}
const goTo = useNavigate();
useEffect(() => {
onAuthStateChanged(auth, (data) => {
if(!data) {
goTo('/login')
}
else {
currentBalance();
requestPermission()
}
})
})
}
Please know I imported all required modules.