Why didn't TurboTax generate a Schedule SE?

I used TurboTax to file my 2021return.  In addition to wages from Forms W-2, I had additional income from Forms 1099-NEC and 1099-G, so TurboTax generated a Schedule 1, which includes a $99 business loss from Schedule C, $24,751 in unemployment compensation (from Form-1099G), and a $5,000 Wisconsin Tomorrow Small Business Recovery Grant (from Form-2099G), for a total Additional Income of $29,652.  However, TurboTax did NOT generate a Schedule SE.

 

Yesterday I received a letter from the IRS telling me I should have include a Schedule SE.  Why didn't TurboTax generate a Schedule SE?  Was I supposed to pay self-employment tax on my unemployment compensation and grant money?  And if so, why didn't TurboTax know this?  Can I now use TurboTax to fill out a Schedule SE, even though I've already filed my return?  

 

Thanks very much to anyone who can help me!!!