You got the 3600? You entered 2400 and 1200 in the 2 boxes that you already got it? Was your child born in 2020?
Go back to My Info and make sure you said your baby lived with you the WHOLE YEAR and not just the number of months. Even a baby was born on Dec 31 is considered to live with you the whole year. You might have to delete the baby and re add him. Pay attention to the questions, especially the one asking if he paid more than half of his support.
