I'm afraid your question is a little confusing, as it seems you are interchanging Microsoft Flow, with SharePoint Workflow. Could you be more specific? Also, what kind of task list are you speaking of?
There are tasks lists in Outlook, SharePoint, Microsoft Planner, Trello and many other platforms that have Flow connectors. Please be as thorough and as detailed as possible in your response, so we may better assist you.
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