"Subscription class not found" with ActionCable and Rails 6 API

I use ruby 3.0.2p107, Rails 6.1.6 and I've a Rails backend (API) and a React Typescript frontend.

Backend code

# app/channels/notification_channel.rbclass NotificationChannel < ApplicationCable::Channel  def subscribed    stream_from "notification_channel_#{current_user.user_id}"  end  def unsubscribed; endend

# app/channels/application_cable/connection.rbmodule ApplicationCable  class Connection < ActionCable::Connection::Base    identified_by :current_user    def connect      self.current_user = find_user    end    private     # search the current user    def find_user      current_user = Profile::Account.find_by(user_id: request.query_parameters[:user_id])      current_user ? current_user : reject_unauthorized_connection    end  endend

Frontend code

    const createSubscription = (consumer: ActionCable.Cable) => {        consumer.subscriptions.create({ channel: `notification_channel_${user.sub}` }, {            connected: () => console.log(`connected to notifications.${user.sub}`),            received: (notification) => handleReceivedNotification(notification),        });    };    const handleReceivedNotification = (notification: any) => {        console.log(JSON.stringify(notification));    }    useEffect((): void => {        if (user) setComsumer(ActionCable.createConsumer(`ws://localhost:3100/cable?user_id=${user.sub}`));    }, [user]);    useEffect((): void => {        if (consumer) createSubscription(consumer);    }, [consumer]);

When I run the app (backend and frontend) I get the connection but can't find the subscription class.

Registered connection (Z2lkOi8vYXBpL1Byb2ZpbGU6OkFjY291bnQvMQ)Subscription class not found: "notification_channel_facebook|10157537128720479"

Also if I try a broadcast from command line, it does not work out (returns 0).

$ ActionCable.server.broadcast "notification_channel_#{user.user_id}", { action: "new_notification" }D, [2022-07-07T14:44:03.820530 #19220] DEBUG -- : [ActionCable] Broadcasting to notification_channel_facebook|10157537128720479: {:action=>"new_notification"}=> 0

I checked also the Redis channels but I can't find the notification_channel.

Redis.new.pubsub("channels")=> ["action_cable/Z2lkOi8vYXBpL1Byb2ZpbGU6OkFjY291bnQvMQ", "_action_cable_internal"]

Here my config/cable.yml config file

default: &default  adapter: redis  url: redis://localhost:6379/1development:<<: *defaulttest:<<: *defaultproduction:  adapter: redis  url: <%= ENV['REDIS_URL'] %>  channel_prefix: api_production

Here the imports of config/application.rb

require "rails"# Pick the frameworks you want:require "active_model/railtie"require "active_job/railtie"require "active_record/railtie"require "active_storage/engine"require "action_controller/railtie"require "action_mailer/railtie"require "action_view/railtie"require "action_cable/engine"# require "sprockets/railtie"require "rails/test_unit/railtie"# activate the action mailer systemrequire "active_storage/engine"require "action_mailbox/engine"

I believe I've been through all the documentation I could find about the topic, but I'm starting loose on options. Any help would be really appreciated.

Thanks