What should I do if I'm not self employed but I received a 1099-NEC

To enter a Form 1099-NEC that is not for self-employment -

Click on Federal (Personal using Home & Business)
Click on Wages & Income (Personal Income using Home & Business)
Scroll down to Other Common Income 
On Form 1099-NEC, click the start or update button

Or enter 1099-nec in the Search box located in the upper right of the program screen.  Click on Jump to 1099-nec

On the screen Did you get a 1099-NEC?, click on Yes
On the screen Do You Want to Enter Your 1099-NECs Now?, click on Add a 1099-NEC
On the screen Let's get the info from your 1099-NEC, enter your information and Continue
On the screen Describe the reason for this 1099-NEC, enter a reason and Continue
On the screen Does one of these uncommon situations apply? -

Select This is not money earned as an employee or self-employed individual, it is from a sporadic activity or hobby and Continue

The amount entered from the Form 1099-NEC will be entered on Schedule 1 Line 8z
The total from Schedule 1 Part I Line 10 flows to Form 1040 Line 8

 This is non-employee compensation.  What was the income from that was reported on the 1099-NEC.  The IRS might consider you to be self-employed. You don't have to carry on regular full-time business activities to be considered self-employed.