Scheduled tasks on Windows 10 are created by the OS as well as by users. The tasks that Windows 10 creates are for running essential services, checking for updates, and periodically checking/ensuring that Windows 10 is activated. If you ever look through the list of scheduled tasks in the Task Scheduler app you will see that there are quite a few of them and they all run silently. It’s rare that a task will ever indicate that it has run. It’s only when it fails that you might see a notification but even that’s not a given. If you want to get an alert when a task completes, you have to manually add it.