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    Error "Resume this workflow ... Exception details: System.ArgumentException: AssignedTo at"

    Summary
    In Office 365, when running a workflow that creates a task, the workflow might suspend when creating the task and the following error might appear in Details: Resume this workflow <javascript:resumeworkflow4('4a719552-bc96-4531-93ca-5c210677a74e');> RequestorId: 96e1442d-d3c3-c868-0000-000000000000. Details: An unhandled exception occurred during the execution of the workflow instance. Exception details: System.ArgumentException: AssignedTo at

    Solution
    1. Review the Assignee in the Task and ensure the variable is in working order.
    2. Delete the variable and publish,
    3. In the workflow, add the variable and publish.