expo: [iOS] getExpoPushTokenAsync can't work on first time iOS . need restart ?

🐛 Bug Report

I have install expo-notification to use on my Bare workflow app . On android it work as expected . How ever , on iOS (xcode 11) . the getExpoPushTokenAsync just hang on the first time opening app ( notification is allowed ) . The only way to get it work is restart the app ( kill app then re open ) . Any one know the root cause . Please share

Environment

Expo CLI 3.19.2 environment info:
    System:
      OS: macOS 10.15.3
      Shell: 3.2.57 - /bin/bash
    Binaries:
      Node: 13.13.0 - /usr/local/bin/node
      Yarn: 1.22.4 - /usr/local/bin/yarn
      npm: 6.14.4 - /usr/local/bin/npm
      Watchman: 4.9.0 - /usr/local/bin/watchman
    IDEs:
      Android Studio: 3.6 AI-192.7142.36.36.6392135
      Xcode: 11.4/11E146 - /usr/bin/xcodebuild
    npmPackages:
      expo: ^37.0.8 => 37.0.8 
      react: 16.9.0 => 16.9.0 
      react-native: 0.61.4 => 0.61.4 
      react-navigation: ^4.2.2 => 4.2.2 
    npmGlobalPackages:
      expo-cli: 3.19.2

Steps to Reproduce

Open the app in iOS , log or show the push token . First time open app , request for notification allowed . No pushtoken . Debug show that getExpoPushTokenAsync hang .

Kill app then reopen . getExpoPushTokenAsync can get the push token and show as expected

Expected Behavior

Push token must be granted for the first time open app

RegisterPushToken code

import * as Notifications from "expo-notifications";
import Constants from "expo-constants";

export default async () => {

 await Notifications.requestPermissionsAsync();

  let experienceId;
  if (!Constants.manifest) {
    // Absence of the manifest means we're in bare workflow
    experienceId = "@redclouds/TappoMerchant";
  }
  const expoPushToken = await Notifications.getExpoPushTokenAsync({
    experienceId
  });

  console.log("expoPushToken.data", expoPushToken.data);
  __DEV__ && console.warn("ExponentPushToken", expoPushToken.data);

  return Promise.resolve(expoPushToken.data);
};