404 error even tho the route exist

Hi, I can't figure out why my route is not working. I always get 404 error when trying to access it, I have tried php artisan route:clear, php artisan optimize:clear and php artisan cache:clear but nothing changes.

Here is the route I'm trying to visit (I can see the route when I run php artisan route:list)

Route::get('/test/mail', function () {
    $booking = Rental::where('id', 3)->with([
        'car',
        'customer',
        'drivers',
        'price',
        'packages',
        'insurances',
        'extras'
    ])->firstOrFail();

    Mail::to($booking->customer->email_address)->send(new BookingConfirmed($booking));

    return "Hallo world";
});