Remember that if you are not the parent where the child lives more than half the nights of the year, you can't claim the child as a dependent unless the other parent gives you a signed form 8332 dependent release. Then in Turbotax, indicate the child lived with you less than half the year, and that you do have a signed form 8332. You will get the child tax credit, but you don't qualify for head of household, or the child care credit, or EIC, because those benefits always stay with the parent where the child lives more nights of the year, and can't be waived, transferred or shared, even by court order. After you e-file, you must mail the original form 8332 to the IRS with a cover page that Turbotax will tell you to print. If you file by mail you must include the original signed 8332.
If you have been claiming your child without form 8332 by saying the child lived with you when they did not, you may be in the wrong, not your ex.
Filing properly with form 8332 sometimes clears an e-file block that is caused by claiming the child lived with you when it did not. But in this case, the e-file block might also be caused if your ex filed a "non-filer" return.
