business name in 1040 schedule C

I received 1099NEC because I taught a lecture in another university. I did not register a business to teach, nor do I have a business name for it. Although I do not anticipate teaching another lecture in the foreseeable future, I learned that I will have to complete 1040 schedule C. I entered the business code, which I found in the instruction of 1040 schedule C, but I am currently stuck at line C - business name. Instruction from Turbotax Delexe 2022 says the line can be left blank if "no separate business name". However, I tried both

a) enter nothing into line C, and

b) enter a blank into line C

neither enables Turbotax to transmit my tax return electronically. Turbotax would just day "before you e-file, we need a little more information that we didn't need earlier" and redirect me to line C of 1040 schedule C, and the cycle goes on and on.

 

Can anyone let me know how to get around it and e-file my tax return?  Or do I have to file in paper?  Please let me know if I could provide any related information.

 

Thanks!