Scheduled Tasks are:

• Scheduled replies
• Scheduled tweets
• Scheduled quote tweets
• Reminders

To check why a schedule task failed:

1. Open twitter.com and open the Magic Sidebar
2. Navigate to the Home page (or visit twitter.com/home)
3. You will see the list of scheduled tasks on the top of the sidebar:

1. Click the ⚠️ icon to see the error details.