Broadcasting not working on my project.

[AbhinavNmdo]

My lighthouse broadcasting is not working. I followed the instructions mentioned in the docs, but it is not working.

Here are my codes.
message.graphql (which is imported in the schema.graphql)

type Subscription {
  messageSent(chatId: ID): Message! @subscription(class: "App\\GraphQL\\Subscriptions\\MessageSent")
}

extend type Mutation {
  sendMessage(
    messageId: ID @rules(apply: ["nullable", "exists:messages,id,deletedAt,NULL"])
    chatId: ID! @rules(apply: ["required", "exists:chats,id,deletedAt,NULL"])
    userId: ID! @rules(apply: ["required", "exists:users,id,deletedAt,NULL"])
    message: String! @rules(apply: ["required", "max:2024"])
  ): Message! @create @guard @broadcast(subscription: "messageSent")
  
  reactOnMessage(
    messageId: ID! @rules(apply: ["required", "exists:messages,id,deletedAt,NULL"])
    userId: ID! @rules(apply: ["required", "exists:users,id,deletedAt,NULL"])
    reaction: String! @rules(apply: ["required", "max:255"])
  ): Reaction! @create @guard
  
  removeReaction(
    id: ID! @eq @rules(apply: ["required", "exists:reactions,id"])
  ): Reaction! @delete @guard
}

MessageSent.php

<?php declare(strict_types=1);

namespace App\GraphQL\Subscriptions;

use GraphQL\Type\Definition\ResolveInfo;
use Illuminate\Http\Request;
use Nuwave\Lighthouse\Schema\Types\GraphQLSubscription;
use Nuwave\Lighthouse\Subscriptions\Subscriber;
use Nuwave\Lighthouse\Support\Contracts\GraphQLContext;

final class MessageSent extends GraphQLSubscription
{
    /** Check if subscriber is allowed to listen to the subscription. */
    public function authorize(Subscriber $subscriber, Request $request): bool
    {
        return true;
    }

    /** Filter which subscribers should receive the subscription. */
    public function filter(Subscriber $subscriber, mixed $root): bool
    {
        return true;
    }
}

LIGHTHOUSE_SUBSCRIPTION_STORAGE=file
LIGHTHOUSE_SUBSCRIPTION_STORAGE_TTL=3600

didn't see anything in the debug console.