A 17 year old child can be your dependent for EIC but you do not get the child tax credit for a child who was 17 at the end of 2020. So look at the form again. It should be checked that the child is a dependent for the credit for other dependents. On a 2020 tax return you do not get CTC or recovery rebate credit for a child who was 17 at the end of 2020.
The rules are different for the 3rd stimulus check---you can get the 3rd stimulus check for your 17 year old.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**