Your qualifying child's social security number listed for EIC cannot also be listed as the spouse SSN on another accepted return for the same tax year.
Fix #1: Sign into your PriorTax account to remove the child and resubmit your return for filing without claiming the EIC.
Fix #2: Amend the already accepted return in which the qualifying child was listed as the primary taxpayer's spouse. Then resubmit this rejected return with the qualifying child reported.
Fix #3: If the SSN was reported incorrectly, simply sign into your PriorTax account to update the information from your rejection status page