Tax Year Prior to 2020: Need advice on claiming EIC after a TurboTax glitch denied me this credit

Hi there: when I filed taxes last week, the Turbotax software failed to process my Earned Income Credit. This means that my return has no Schedule EIC.

 

In order to amend my return will I need to file Schedule EIC along with the 1040X?

 

Will I also need to file Form 8862 (Information to Claim Certain Credits After Disallowance)?

 

I wold be so grateful for advice, as I find taxes really intimidating...