Firebase Cloud Messaging push notification not being sent to device

I am currently working on creating push notification set up for a user to user setting for the iPhone. I am currently using Firebase, so naturally I turned to Firebase Cloud Messaging to get this done. This is my setup in the functions that I am deploying to my Firebase. Is there something that I am doing wrong in here that would result in the notification not being sent to the device? I appreciate any help, and if there is any more needed information I would be happy to supply it.

const functions = require('firebase-functions');

const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

// Listens for new messages added to messages/:pushId
exports.pushNotification =     functions.database.ref('/messages/{pushId}').onWrite( event => {

console.log('Push notification event triggered');

//  Grab the current value of what was written to the Realtime Database.
var valueObject = event.data.val();
console.log(valueObject)

if(valueObject.photoUrl != null) {
  valueObject.photoUrl= "Sent you a photo!";
}

 // Create a notification
const payload = {
    notification: {
        title:valueObject.toId, 
        body: valueObject.text || valueObject.photoUrl,
        sound: "default"
    },
};

//Create an options object that contains the time to live for the notification and the priority
const options = {
    priority: "high",
    timeToLive: 60 * 60 * 24
};
return admin.messaging().sendToTopic("pushNotifications", payload, options);
 if(!data.changed()){

});

exports.pushNotification = functions.database.ref('/messages/{pushId}').onWrite( event => {
const data = event.data;
console.log('Push notification event triggered');
return;
}



});

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