The IRS does not ask for the NAICS code on Schedule C.  It asks for the Principal Business Activity Code, which is from the list in the Instructions.

Pick the one that is closest.

Try here: https://www.naics.com/business-lists/counts-by-naics-code/#countsByNAICS.

The principal business codes are from the naics codes, and the list provided in the tax programs are not all inclusive