Running a powershell task to call exe while logged off

So I have been researching for hours and tried various solutions, I am still having trouble getting an exe to run while logged off.   This is a utility for a 3rd party program called sync.exe.  It will not run when called directly in task scheduler.

So we are trying a powershell script which works fine when logged in an running it manually outside task scheduler.  But once we set it as a scheduled task, the script apparently runs but the exe that it calls does not start.

We have tried running as a admin group and also privileged AD account.  I am using the start-process command in the script and pointing directly to sync.exe.  It is located on a local drive so it is not networked.

We cannot figure out why the exe does not run while logged off.