I've tried query and run parameters but not yet for create.
It is required to provide the task name including the folder that task is created in.
To query if a task exists
>schtasks /query /tn "thelog"
ERROR: The system cannot find the file specified.
>schtasks /query /tn "Microsoft\thelog"
Folder: Microsoft
TaskName Next Run Time Status
======================================== ====================== ===============
thelog N/A Ready
>schtasks /query /tn "Microsoft\the special log"
Folder: Microsoft
TaskName Next Run Time Status
======================================== ====================== ===============
the special log N/A Ready
To run the task
>schtasks /run /tn "Microsoft\thelog"
SUCCESS: Attempted to run the scheduled task "Microsoft\thelog".
>schtasks /run /tn "Microsoft\the special log"
SUCCESS: Attempted to run the scheduled task "Microsoft\the special log".
It is needed to run tasks in elevated command prompt though.