To allow un-authenticated users to access workflow,
Navigate to Application Management in SharePoint central administration, click on manage web applications link in Web Applications section.
Select the web application to configure workflows and click on General Settings tab in ribbon.
We can see Workflow Settings dialog box. In Workflow Task Notification section select Yes in Alert internal users who do not have site access when they are assigned a workflow task? Option to send e-mail to internal users. Select Yes option for Allow external users to participate in workflow by sending them a copy of document? Option. Click on Ok to save the settings.

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