You can create tasks via Flow in a variety of ways such as Planner tasks, SharePoint list items, etc..
Can you elaborate on your requirements?
I want to create review tasks ( parallel ) , on completion I would like to be able to query through them if any one of them has rejected the document, I would like to get all the comments back to the author. ( kind of state machine flow )
Have you considered using a Start and Wait for Approval action that requires all approvers to approve? You will have access to all comments and approvals happen in parallel. This would be simple to implement.
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