I have an 18 year old who is still a dependent but it is not letting me claim the child tax credit; does anyone know why?

I should be able to claim my 18 year old with the child tax credit since they are still in high school and live with me full time; why does it keep saying they do not qualify?
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    The child tax credit is for children under 17. You still get the dependency exemption, but not the child tax credit
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