Tax Year Prior to 2020: Why do I need to file a 1040 when I don't own a business?

I have done my research and from all I've read I don't need to file a 1040 if I don't own a business. This is the first time having an issue with using Turbo Tax. I also contacted the IRS since it says it's because of them that I have to file a 1040 and they said I don't have to. Now with this said I should be able to do my taxes here on Turbo Tax. Can anyone answer my question on why this keeps coming up?