This post is developed by the trial and error principle 😉 . Here you can find some background.
On Windows a User with just “normal” user rights cannot see and execute Tasks created from User with Administrator permissions. There are dozed of sites that describes that the permissions of an task can be changed by setting the filesystems rights in C:\Windows\System32\Tasks. But this won’t work since some early Versions of Windows 10 (IMHO 1607).