Task Scheduler: An error has occured for task “taskname”. Error message: The following error was reported: A specified logon session does not exist. It may already have been terminated..

Run rsop.msc or secpol.msc as Administrator and check if the following policy is configured:

Computer Configuration | Windows Settings | Security Settings | Local Policies | Security Options |
Network access: Do not allow storage of passwords and credentials for network authentication

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