Surprising to hear you were issued Form 1099-K as that form is for third party payers, such as PayPal.
You can enter the 1099-K under
Income
Other Common Income
Income from Form 1099-K
Select "Hobby income" or "Self-Employment income" (depending how you treat it) from the list on the "Which type of income is your 1099-K for?" screen.
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