You will not be prompted separately for a 1099K form as the IRS does not require it to be entered as a stand alone form. Enter the 1099 K income along with the rest of your income that is not reported on a 1099 MISC form as General Income for Schedule C. See the sample screenshot below, plus steps to be brought to this section of TurboTax:
Type
Schedule C in the FIND box at the top of the screen and then
select the Jump to link. This will take
you to where you can enter any cash, personal checks, credit card
payments, or cryptocurrency (Form 1099-K) related to your
self-employment. You may first be asked some general questions about your
business. After you answer them, you’ll be taken to the Business Income screen where you
can enter this income as General Income.
