How can I fix "The operator or administrator has refused the request" in task scheduler?

I am trying to run a .exe with task scheduler when the computer goes idle. I have made a small .bat that installs the task automatically. I have tried many computers and many solutions around the internet, but I still end up with this error. Can anyone shed some light on what is going on? (Also, I'm not super tech-savvy so please explain in an easy to understand way, thanks)

The operator or administrator has refused the request (0x800710E0)