This issue is related to group policy: Network access: Do not allow storage of credentials or .NET Passports for network authentication. When this policy is enabled Site Administrator can't create it's scheduled tasks. If you disable this policy you will be able to create the scheduled tasks after all. To do it you can use attached scripts. Create these scripts in the SharePoint Information Portal\Setup folder and execute the schtasks_install.cmd script. Result of the execution you will find in theSharePoint Information Portal\Logs\setup.log file.

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