earned income credit

I filed my federal return using Turbo Tax which determined I am not eligible for the earned income credit.  Now I just received a letter from the IRS telling me I am eligible.  The letter includes Form 15112 EIC Worksheet and based on the questions on the worksheet it looks like I should be eligible.  Turbo tax asked questions about my 2019 earned income to help determine eligibility, but this worksheet does not ask any questions about 2019 income.