I am not sure where you saw the message 'I should have received a w-2 instead of a 1099-nec', but Form SS-8 is not supported by TurboTax, so I doubt that message will generate the SS-8 form.
The form and instructions are below. Filing a Form SS-8 requesting a “worker status” determination means you or the firm is asking the Service to establish if the services you provide to the firm are those of an employee or an independent contractor.
Form SS-8 PDF
Instructions for Form SS-8 (Print versionPDF)
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