@bjust9 - okay, so the $2900 is correct based on your AGI. and since you received $1500 as the Advance, then $1400 on Line 28 is correct.
On Form 8812 - only Part 1A and Part 1B needed to be filled out; the rest of the form should be blank. So Turbo Tax did it correctly.
Since your child is over 5 years old, there isn't anything unusual about the social security number? you've had it (and it is correct on the tax return) since shortly after the child was born?
So what went wrong? I suspect a key punch error, which is the risk of a paper file.
Suggest calling the IRS (ugh), but you may have to amend to get the $2900 back. What do the instructions on the notice you received from the IRS inform you to do?
