Ok ... then back to my other answer.
If the SS# has already been thru the TT system and TT rejected it (not the IRS) so you have to print/mail in the return. OR you can try using one of the IRS free file options and if the return is rejected due to duplication then you will have to print/mail in the return after all.
FYI ... if the child's SS# has already been thru the IRS system not as a dependent then this is mess up your return as well ... you may need to print/mail in your return as well.
