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What is the reject code?

If you are the non-custodial parent that the child did not physically live with then you can only claim the child's exemption and child tax credit.  You can never claim the EIC or child care credit - those both require that you physically lived with the child and the custodial parent gets to claim  those credits.  Perhaps you are trying to claim a credit that you are not entitled to claim.   A dependent is only the exemption that a court can order - other credits are determined by Federal tax law that a court cannot change.

If you are the non-custodial parent where the child did not physically live for more than half the year (183 nights) then:

When you enter the dependent, you say that he is "Your child" (not you and new spouse if remarried),
He/she lived with you zero months,
“no” the child did not pay more than half of his/her own support,
"yes", you have a custody agreement, and
"yes” I am claiming this year.

That will give you the child's exemption, and child tax credit.  
 
The EIC, and Child Care Credits can only be claimed by the parent where the child actually lived.     
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**