Node.js 获取用户 ID 后，Firebase 函数 onCreate 方法在 Firestore 上不起作用

我正在try 获取用户的用户ID，然后在Firebase函数中的FireStore上运行onCreate函数以获得后台通知，但onCreate函数不运行.函数显示其已执行和已完成.

import { https, firestore, logger } from "firebase-functions";
import { initializeApp, messaging, firestore as _firestore } from "firebase-admin";

initializeApp();
const fcm = messaging();
const db = _firestore();

export const friendRequest = https.onCall((data, context) => {
  const userID = context.auth.uid;
  try {
    db.collection("users")
      .doc(userID)
      .collection("tokens")
      .doc("token")
      .get()
      .then((value) => {
        const token = value.data().token;
        firestore
          .document(`users/${userID}/recievedRequests/{request}`)
          .onCreate((snapshot) => {
            const senderName = snapshot.data().name;
            logger.log(
              "New Notification to " + token + " ,by :" + senderName
            );
            const payload = {
              notification: {
                title: "New Friend Request",
                body: `Friend Request from ${senderName}`,
              },
            };
            fcm.sendToDevice(token, payload).then((response) => {
              logger.log("Response" + response.successCount);
            });
          });
      });
  } catch (error) {
    logger.log("Error : " + error);
  }
});

This is the Friend Request function I want to send notification to user when he receives a notification. My firebase log shows