A child can only be claimed as a dependent on one tax return.
If the other parent is the one who is entitled to claim the child, and their return was rejected from e-filing, they should file their return by mail to claim the child.
If you incorrectly claimed the dependent credit, you should amend your return to remove the dependent credit and pay any amount due. Otherwise, you would likely eventually be audited if the other parent also claims the child, and you may end up paying additional tax along with interest and possibly penalties.
Please see this IRS tax tips article for more information about claiming a child as a dependent when parents are separated or divorced.
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