@Amber1108
Turbotax has nothing to do with your problem. If your ex claimed your child as a dependent, then you will be blocked from e-filing no matter what provider you use. You could upgrade to TurboTax Live online to have the support of a professional tax preparer, but if you have a completed tax return, there is nothing else they could do for you either. Your return must be mailed to the IRS and once the IRS has it, there is nothing that any tax professional can do to expedite your tax return.
A non-custodial parent can never claim the child legally without a signed form 8332, or a divorce order from before 2009. If you and your ex both claim your child, the IRS should eventually investigate, and if you can prove the child lived in your home more than half the nights of the year, your ex will have to re-pay any tax credits or benefits with interest and penalties. But that may take more than a year to happen.
The one option that might prevent this in the future would be to file an identity theft claim with the IRS using form 14039-T, or by opting in your child into the identity protection pin scheme at the IRS. Once you and your child have identity protection pins, no one can e-file a tax return with your child‘s name on it without including the pin. The IP pin changes every year and a new one is mailed to you by the IRS in December. That would prevent your ex from claiming your child in the future because your ex would not have the IP pin.
https://www.irs.gov/identity-theft-fraud-scams/get-an-identity-protection-pin
