How do you at (@) someone in slack using the laravel slack notification api?

I’ve got a functioning notification system that can post to Channel in our companies Slack. However, everything that comes across is just text. The linkNames is suppose to find/link user names in your content. I see that it gets set to “1” but has no affect when it shows up in the channel.

 namespace AppNotifications;

use IlluminateBusQueueable;
use IlluminateContractsQueueShouldQueue;
use IlluminateNotificationsNotification;
use IlluminateNotificationsMessagesSlackMessage;
class Dd extends Notification
{
use Queueable;

/**
 * Create a new notification instance.
 *
 * @return void
 */
public function __construct()
{
    //
}

/**
 * Get the notification's delivery channels.
 *
 * @param  mixed  $notifiable
 * @return array
 */
public function via($notifiable)
{
    return ['slack'];
}


/**
 * Get the array representation of the notification.
 *
 * @param  mixed  $notifiable
 * @return array
 */
public function toArray($notifiable)
{
    return [
        //
    ];
}

/**
 * Get the Slack representation of the notification.
 *
 * @param  mixed  $notifiable
 * @return SlackMessage
 */
public function toSlack($slackComment)
{   
    $slackMessage = new SlackMessage();
    $slackMessage->linkNames();
    $slackMessage->from('Christopher');
    $slackMessage->to($slackComment->channel);
    $slackMessage->content("Harded coded for example @christopher <- this doesn't get linked to the user in slack but should");
     $slackMessage->info();
    //dd($slackMessage); // this shows that the linkedNames attribute has been set to "1"
    return $slackMessage;             
}

}

Is this a known issues, a version mismatch, or am I missing something?

Answer

https://api.slack.com/reference/surfaces/formatting#mentioning-users

To mention a user in app-published text, you need to provide their user ID in the following syntax:

Hey <@U024BE7LH>, thanks for submitting your report.