ldc-supportweb/app/Mail/NewTicket.php

<?php

namespace App\Mail;

use App\Models\Ticket;
use Illuminate\Bus\Queueable;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;

class NewTicket extends Mailable
{
    use Queueable;
    use SerializesModels;

    /** @var \App\Models\Ticket */
    private $ticket;

    /**
     * Create a new message instance.
     *
     * @param \App\Models\Ticket $ticket
     * @return void
     */
    public function __construct(Ticket $ticket)
    {
        $this->ticket = $ticket;
    }

    /**
     * Build the message.
     *
     * @return $this
     */
    public function build(): self
    {
        $ticket = $this->ticket;
        return $this->subject("[Support] Nouveau ticket n°" . $ticket->id)
            ->view('emails.new-ticket', compact('ticket'));
    }
}