Environment: windows, wamp service, php, scheduled task.
To having access for some resources, I configured wamp service to running as user User_A (admin group).
I have a protected folder Protected_Folder: only users in admin group have full access.
I have a scheduled task who execute everyday with User_A account. It is configured to run even if User_A is logged out: a .bat file:
C:/path/to/php.exe my_script.php
However, the scheduled task do not have privilege to create/write a file/folder in Protected_Folder if the user is logged out.
I had the same problem but I do not know if I solved it by a combination of circumstance or because I have found the right solution.
So I edited my batch file to open a page instead of launching directly the PHP script
@echo off
start "" http://localhost/path/to/my_script.php
And it finally worked, I hope it will help you