Unable to send notifications from server (SDK 37, Android and Ruby server)

Hi there,

I hope you could help me, from days this issue is driving me crazy.
I have an android app build with Expo, my server is written in Ruby. This one is responsible to send a notification to OP each time someone comment his post.

It working well locally. But when I am dealing with the beta version none notifications is displayed. It sounds that all notifications are sent, but never displayed.

But if I use the notifications tools test made by Expo, it works !

Below my code server-side;

class PushNotificationService
  attr_reader :title, :user_id
  include HTTParty

  def initialize(args)
    @title = args[:title]
    @user_id = args[:user_id]

  def call
    expo_token = ExpoToken.find_by(user_id: user_id)
    return if expo_token.nil?

      body: {
        'to' => expo_token.token,
        'title' => title

My client-side

export default registerForNotifications = async (token) => {
  const { status } = await Permissions.getAsync(Permissions.NOTIFICATIONS);
  if (status !== 'granted') {
    const { status } = await Permissions.askAsync(Permissions.NOTIFICATIONS);
    if (status !== 'granted') {

  const expoToken = await Notifications.getExpoPushTokenAsync();
  fetch(PUSH_ENDPOINT, {
    method: 'POST',
    headers: {
      'Accept': 'application/json',
      'Content-Type': 'application/json',
      'Accept-Encoding': 'gzip, deflate',
    body: JSON.stringify({
      expo_token: expoToken,
      token: token,

I have another app published on PlayStore, I reused exactly the same code and notifications works well. But it was written with Expo SDK 32.

I guess a lot of things change between 32 and 37, but why it works well locally ? And why it works with the Expo notification test tools ?

Any help will be really appreciate.


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