Laravel Echo私有频道认证返回401 Unauthorized问题求助

问题现象 #

• 普通频道下Reverb与Echo运行正常，但订阅私有频道时，/broadcasting/auth路由返回401 Unauthorized，响应体为{"message":"Unauthenticated."}
• 发起请求的用户已正常登录前端路由，但认证失败

已配置内容 #

1. 广播中间件设置（bootstrap/app.php） #

return Application::configure(basePath: dirname(__DIR__))
    ->withRouting(
        web: __DIR__ . '/../routes/web.php',
        api: __DIR__ . '/../routes/api.php',
        commands: __DIR__ . '/../routes/console.php',
        health: '/up',
    )
    ->withMiddleware(function (Middleware $middleware) {
        $middleware
            ->web(append: [
                HandleInertiaRequests::class,
                AddLinkHeadersForPreloadedAssets::class,
            ])
            ->trustProxies('*')
            ->validateCsrfTokens();
    })
    ->withBroadcasting('/../routes/channels.php', attributes: ['middleware' => ['api', 'auth:sanctum']])
    ->withExceptions()
    ->create();

2. User模型广播配置 #

class User extends Authenticatable
{
    use HasApiTokens;
    use HasFactory;
    use HasProfilePhoto;
    use Notifiable;
    use TwoFactorAuthenticatable;
    use BroadcastsEvents;

    ...

    public function broadcastOn($event): PrivateChannel
    {
        return new PrivateChannel('users.' . $this->id);
    }
}

3. Echo前端配置 #

window.Echo = new Echo({
  broadcaster: 'reverb',
  key: import.meta.env.VITE_REVERB_APP_KEY,
  wsHost: import.meta.env.VITE_REVERB_HOST,
  wsPort: import.meta.env.VITE_REVERB_PORT ?? 80,
  wssPort: import.meta.env.VITE_REVERB_PORT ?? 443,
  forceTLS: (import.meta.env.VITE_REVERB_SCHEME ?? 'https') === 'https',
  enabledTransports: ['ws', 'wss'],
  encrypted: true,
  authorizer: (channel, options) => {
    console.log('a');
    return {
      authorize: (socketId, callback) => {
        console.log('b');
        axios
          .post(
            '/broadcasting/auth',
            {
              socket_id: socketId,
              channel_name: channel.name,
            },
            {
              withCredentials: true,
              headers: {
                Accept: 'application/json',
              },
            }
          )
          .then(response => {
            callback(false, response.data);
          })
          .catch(error => {
            callback(true, error);
          });
      },
    };
  },
});

4. 前端订阅代码 #

onMounted(() => {
  if (user.value) {
    window.Echo.private(`users.${user.value.id}`).listen(
      '.UserUpdated',
      (event: { model: UserData }) => {
        console.log('Received user update from reverb!', event);
      }
    );
  }
});

补充说明 #

• 使用Jetstream启动套件，未对默认配置做重大修改
• channels.php为空
• 已查阅Laravel Sanctum私有频道认证官方文档，问题未解决

内容的提问来源于stack exchange，提问作者dannypas00