'No scheduled commands are ready to run' when command is set to run every minute

Following on from an earlier thread, I have a command which currently runs every minute (will be daily once development is complete) to check if any courses are running today and, if so, send a reminder email:

$schedule->command('dailyCourse:reminder')->everyMinute();

My earlier problem was with SwiftMailer (composer update seemed to do the trick) and when I ran my command it fired off the email. I stopped the command and tidied up my testing code (removed info() logging etc) and when I ran my command again…

php artisan schedule:work

…my console log said:

[2022-09-13T08:27:00+01:00] Execution #1 output:
No scheduled commands are ready to run.

So, why would it ignore the command since its set to run each minute, and how would I fix it?

Here's my command code:

<?php

namespace App\Console\Commands;

use Illuminate\Console\Command;

use Carbon\Carbon;
use Mail;

use App\Models\Course;
use App\Models\Coursesettings;
use App\Mail\GenericEmail;

class DailyCourseReminder extends Command
{
  /**
   * The name and signature of the console command.
   *
   * @var string
   */
  protected $signature = 'dailyCourse:reminder';

  /**
   * The console command description.
   *
   * @var string
   */
  protected $description = 'Command description';

  /**
   * Create a new command instance.
   *
   * @return void
   */
  public function __construct()
  {
    parent::__construct();
  }

  /**
   * Execute the console command.
   *
   * @return int
   */
  public function handle()
  {
    $email_recipients = [];
    $courses = Course::with('bookings')->where('start_date', Carbon::today())->get();
    foreach ($courses as $course) {
      $bookings = $course->bookings;
      // Grab the bookings
      foreach ($bookings as $booking) {
        // Grab the attendees
        foreach (json_decode($booking->attendees) as $attendee) {
          $email = $attendee->email;
          if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
            array_push($email_recipients, $email);
          }
        }
      }
    }
    // Send the emails
    if ($email_recipients != null) {
      // Grab the Coursesettings key => value pairs
      $settings = Coursesettings::orderby('key', 'asc')
      ->where('key', 'email_attendee_booking_confirmation')
      ->pluck('value', 'key')->toArray();
      // Course type
      if ($course->type == 0) {
        $course_type = 'physical';
      } else {
        $course_type = 'virtual';
      }
      // Set subject
      $subject = 'Reminder: You are enrolled on a course for today';
      // Intro text
      $intro_text = 'Hello, this email is to remind you that you are booked on the following course for today:';
      // Message
      $message_body = $settings['email_attendee_booking_confirmation'];
      // Shortcodes to change
      $message_body = str_replace('[COURSENAME_HERE]', $course->coursename->name, $message_body);
      $message_body = str_replace('[STARTDATE_HERE]', Carbon::parse($course->start_date)->format('d/m/Y'), $message_body);
      $message_body = str_replace('[STARTTIME_HERE]', $course->start_time, $message_body);
      $message_body = str_replace('[ENDTIME_HERE]', $course->end_time, $message_body);
      $message_body = str_replace('[COURSETYPE_HERE]', $course_type, $message_body);

      $message = [
       'intro' => $intro_text,
       'message_body' => $message_body,
       'show_panel' => 'no',
       'panel_body' => 'PANEL_BODY',
       'show_button' => 'no',
       'button_label' => 'BUTTON_LABEL',
       'button_url' => url(''),
       ];

      Mail::to($email_recipients)
       ->send(new GenericEmail($message, $subject)); // End of attendee email
    // info($email_recipients);
    }
  }
}