Why is the EIC not counted if my AIG is just under the two child limit of $46,703. My oldest was 18 at the end of 2019, both my children lived with me all year so I am unsure why I am not receiving this credit.
You can use this interactive IRS tool to see if your income works for EIC:
And do not confuse EIC with the child tax credit. You cannot get CTC for an 18 year old--you lost the CTC when he turned 17. Now you can get the $500 credit for other dependents for him.
Look at your 2019 Form 1040 to see the child-related credits you received
Child Tax Credit line 13a
Credit for Other Dependents line 13a
Earned Income Credit line 18a
Additional Child Tax Credit line 18b
Child and Dependent Care Credit line 18d