Startup task doesn't work, but putting it in Task Scheduler works-why?

On my Win 10 Pro 64-bit Version 1803 machine with 16GB RAM and an i5 Intel chip, I like Task Manager to start automatically on startup.
1) If I put its shortcut in the Startup folder, nothing happens.
2) If I create a TaskScheduler task for it, to start on logon of any user, it works.
Why the difference?

Detail:
1) Win+r, then type shell:startup, then put a shortcut in that "Startup" folder that points to C:\Windows\System32\Taskmgr.exe
2) In Task Scheduler, create a task as follows:

Code:

<?xml version="1.0" encoding="UTF-16"?>
<Task version="1.4" xmlns="http://schemas.microsoft.com/windows/2004/02/mit/task">
  <RegistrationInfo>
    <Date>2015-10-08T18:02:24.7424228</Date>
    <Author>[MyComputerName]\[MyUserName]</Author>
    <URI>\TaskMgr</URI>
  </RegistrationInfo>
  <Triggers>
    <LogonTrigger>
      <Enabled>true</Enabled>
    </LogonTrigger>
  </Triggers>
  <Principals>
    <Principal id="Author">
      <UserId>S-1-5-21-[More Numbers]-1001</UserId>
      <LogonType>InteractiveToken</LogonType>
      <RunLevel>HighestAvailable</RunLevel>
    </Principal>
  </Principals>
  <Settings>
    <MultipleInstancesPolicy>IgnoreNew</MultipleInstancesPolicy>
    <DisallowStartIfOnBatteries>false</DisallowStartIfOnBatteries>
    <StopIfGoingOnBatteries>false</StopIfGoingOnBatteries>
    <AllowHardTerminate>false</AllowHardTerminate>
    <StartWhenAvailable>true</StartWhenAvailable>
    <RunOnlyIfNetworkAvailable>false</RunOnlyIfNetworkAvailable>
    <IdleSettings>
      <StopOnIdleEnd>false</StopOnIdleEnd>
      <RestartOnIdle>false</RestartOnIdle>
    </IdleSettings>
    <AllowStartOnDemand>true</AllowStartOnDemand>
    <Enabled>true</Enabled>
    <Hidden>false</Hidden>
    <RunOnlyIfIdle>false</RunOnlyIfIdle>
    <DisallowStartOnRemoteAppSession>false</DisallowStartOnRemoteAppSession>
    <UseUnifiedSchedulingEngine>true</UseUnifiedSchedulingEngine>
    <WakeToRun>true</WakeToRun>
    <ExecutionTimeLimit>PT0S</ExecutionTimeLimit>
    <Priority>7</Priority>
    <RestartOnFailure>
      <Interval>PT1M</Interval>
      <Count>20</Count>
    </RestartOnFailure>
  </Settings>
  <Actions Context="Author">
    <Exec>
      <Command>C:\Windows\System32\Taskmgr.exe</Command>
    </Exec>
  </Actions>
</Task>

Thanks.

dalchina - thanks for interest. But I think your link is how to do a Task Scheduler entry, which I did and which works.
The problem remains why my Startup entry didn't work.
But please correct me if I have it wrong.

glnz said:

... I like Task Manager to start automatically on startup....

Yes, so do I.

... If I put its shortcut in the Startup folder, nothing happens....

Yes, I found that too. So instead I put a .bat file in the AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Start-up folder, containing:

START /MIN TASKMGR

(I like it to start minimised on the Taskbar)

After a while I got tired of seeing a command window open every time I signed in, so I moved the .bat file out of the Start-up folder into ...\Start Menu\Programs. I then put a shortcut to the .bat file in ...\Start Menu\Programs\Start-up. This meant that I could set the properties of the shortcut to run the .bat file minimised.