If required items aren’t configured for an element, a red circle with a one inside it will appear on the top-left side of the element. That indicates an error. Click on the red one on the element or at the top right corner of the Workflow Builder.
On the screenshot above, the Approve and Sign element is missing the approver’s email address.
You’ll also see the error on the Inbox page regarding the changes in your approval flow. You have the option to either Cancel or Restart the flow.
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