One of the most common reasons you’d receive tax form 1099-NEC (Form 1099-MISC in prior years) is if you're self-employed and did work as an independent contractor during the previous year. The IRS refers to this as “nonemployee compensation.” See TurboTax Tips for more info about 1099-NEC
Since you shouldn't have received a 1099-NEC for truly reimbursed expenses at all, you can request that the payer void the 1099-NEC correctly.
Or you can enter the 1099-NEC as you received it as self-employment income and then report the exact amount as the expense you paid out in the first place to end up with a net $0 Schedule C. See this TurboTax article for information about Filing with a 1099-NEC as self-employment.
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