Setting up expo-notifications on a managed app running a custom client / EAS build Failed to authenticate with the FCM server. Ensure the FCM server key you uploaded is correct.

Please provide the following:

  1. SDK Version: 42
  2. Platforms(Android/iOS/web/all): Android


Hey guys i’m trying to integrate expo notifications in my managed app.
I created a custom client since we are using libraries with native code.
I installed expo notifications.
followed the instructions in the link bellow for android
I am able to get a push token but i’m getting the following response
“data”: Object {
“details”: Object {
“error”: “InvalidCredentials”,
“fault”: “developer”,
“fcm”: Object {
“httpStatus”: 401,
“response”: "



Error 401

", }, }, "id": "35b0c8a9-c62a-40f4-a4d8-b5872b121c65", "message": "Failed to authenticate with the FCM server. Ensure the FCM server key you uploaded is correct.", "status": "error", }, }

"Unless you’re still running your project in the Expo Go app, Firebase Cloud Messaging is required for all managed and bare workflow Android apps made with Expo."

“expo”: {
“name”: “EventShare”,
“slug”: “EventShare”,
“version”: “0.1.0”,
“orientation”: “portrait”,
“icon”: “./assets/1024.png”,
“splash”: {
“image”: “./assets/splash.png”,
“resizeMode”: “contain”,
“backgroundColor”: “#ffffff
“androidStatusBar”: {
“backgroundColor”: “#ffffff”,
“translucent”: true
“updates”: {
“fallbackToCacheTimeout”: 0
“assetBundlePatterns”: ["**/*"],
“ios”: {
“supportsTablet”: true,
“userInterfaceStyle”: “dark”,
“infoPlist”: {
“NSCameraUsageDescription”: “This app uses the camera to take pictures, videos and scan barcodes on from other users.”
“bundleIdentifier”: “com.simplyrem.GalleryShare”,
“buildNumber”: “1.0.8”,
“icon”: “./assets/1024.png”
“android”: {
“jsEngine”: “hermes”,
“googleServicesFile”: “./google-services.json”,
“adaptiveIcon”: {
“foregroundImage”: “./assets/adaptive-icon.png”,
“backgroundColor”: “#FFFFFF

        "userInterfaceStyle": "dark",
        "package": "com.simplyrem.GalleryShare"
    "web": {
        "favicon": "./assets/favicon.png"


Managed or bare workflow? If you have ios/ or android/ directories in your project, the answer is bare!


What platform(s) does this occur on?

Android, iOS

SDK Version (managed workflow only)



Expo CLI 4.7.3 environment info:
OS: macOS 10.15.7
Shell: 5.7.1 - /bin/zsh
Node: 14.15.1 - /usr/local/bin/node
Yarn: 1.22.10 - /usr/local/bin/yarn
npm: 7.8.0 - /usr/local/bin/npm
Watchman: 4.9.0 - /usr/local/bin/watchman
CocoaPods: 1.10.1 - /usr/local/bin/pod
Platforms: iOS 14.4, DriverKit 20.2, macOS 11.1, tvOS 14.3, watchOS 7.2
Android Studio: 4.1 AI-201.8743.12.41.6858069
Xcode: 12.4/12D4e - /usr/bin/xcodebuild
expo: ^42.0.0 => 42.0.0
react: 16.13.1 => 16.13.1
react-dom: 16.13.1 => 16.13.1
react-native: => 0.63.2
react-native-web: ~0.13.12 => 0.13.18
expo-cli: 4.7.3
Expo Workflow: managed

Reproducible demo or steps to reproduce from a blank project

  1. create a custom client
  2. install expo-notifications
  3. create Firebase Cloud Messaging file
  4. drop it in your projects root directory
  5. add “android”: {
    “googleServicesFile”: “./google-services.json”,

  6. rebuild custom client using eas build --profile development --platform android
  7. Run code to get expo notification token.


For android you have to do the Firebase Cloud Messaging steps. For iOS you need to make sure you choose your credentials. Both tasks are explained below.
Unless you’re still running your project in the Expo Go app, Firebase Cloud Messaging is required for all managed and bare workflow Android apps made with Expo. Full Instructions
Here is my version of the FULL instructions on getting notifications working on both platforms after expo install expo-notifications if you are using a custom client and EAS.
Youtube video showing how to add firebase to your project. Start watching from 4:00 minutes Getting started with Firebase on Android (2020) - Firecasts - YouTube

  1. Create a new android project
  2. In your project main page click on the Android Icon
  3. Add the projects package name from your app.jason
  4. Add nickname for your project
  5. Click “Register your app”
  6. Download the google-services.json file and place it in your Expo app’s root directory.
  7. Go to your app.json and the following line and save it
    “android”: {
    “googleServicesFile”: “./google-services.json”,
    “useNextNotificationsApi”: true,
  8. Go to Firebase project, Settings → ProjectSettings → Cloud Messaging → copy the Server key. Run this command to add your FCM SERVER key to your project. expo push:android:upload --api-key AAAACq0C1Mg:APA91bHMt-e2TAR67C-W2pg0At8Jmuamfs29vZK9dsrjXfTRpue4FHfCymMGNhBZwOwspJ8ydbAnNtbddZTrAD1J2nu6cUqcaFjDHIVg-F5CAwUmH70bkYye18rPqY8y48 (note that doing this step on from the GUI does not take effect! …must be taken care of by expo, also the command says --api-key which is confusing because you are uploading the Server key in this step.)
  9. Run eas credentials choose Android, then choose Push Notifications: Manage your FCM Api Key, then paste your long ass API key here as well.
  10. Set up your iOS push notification credentials by running run expo credentials:manager -p ios , then select Use existing Push Notifications Key in current project or use a new one…
  11. Run the command to build your app eas build --profile development --platform both
    12.Make sure to include the experience id in your getExpoPushTokenAsync call. The experience id is @username/appSlug. ex: @haibert/EventShareApp
    token = await Notifications.getExpoPushTokenAsync({
    experienceId: '@username/projectSlug,
  12. To make sure your API key is unrestricted make sure you’re on the correct project when going on the following link Cloud Platform API Credentials console. Then click on the pencil icon on the api for android. It was unrestricted by default but just checked incase.

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