@ydst
You can reply to the IRS that is does belong on Sch 1 line 8 and that the computer who saw a 1099-NEC with more than $400 on it is wrong in that it was missing on the Sch C.
"This is not money earned as employee or self-employed individual, it is from an sporadic activity or hobby."
Of course since you do have a Sch C on the return it may be difficult for you to justify why this amount was not on the Sch C with the other SE income but you can try. Otherwise just pay the balance due the IRS is asking for.... read the CP2000 notice carefully for how to respond if you don't agree.
