A W-9 is not a type of worker, it's a form employers and businesses ask for to verify that you have a legal right to work and provides your tax Identification number.
The problem you are having is that the company sent you a 1099-NEC which is Non-Employee Compensation and that is the same as Self-Employed income.
You might need to "pretend" your husband had a business that lasted the two weeks in order to repot that income.
As a W-2 employee, the employer withholds and pays the FICA tax (social security)
For the income reported on the 1099-NEC, no FICA was paid, so (as you know since you file a schedule C for your small business) that tax is paid through your 1040.
The reason for amending would be something like "Received unexpected 1099-NEC"
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