If you received the Form 1099-NEC for services you performed for another business, then your return may be missing the Schedule C where the Form 1099-NEC should be reported.
Schedule C is for Self-Employed Business Income and Expenses. If you received the Form 1099-NEC, then the IRS sees you as self-employed and you need to complete the Schedule C.
Take a look at the following TurboTax help article for more information about Schedule C:
Where do I enter Schedule C?