Your spouse's SSN on the return must not be the same as the spouse's SSN on another tax return filed in the same tax year.
Fix #1: Sign into your PriorTax account and double check the full name and SSN provided. It should match exactly with what the IRS and Social Security Administration have on file.
Fix #2: Sign into your account and double check your filing status. If your spouse has already filed with a Married Filing Separately status, then you cannot attempt to file a joint tax return. You can update your filing status from your rejection status page.
Fix #3: If the name and SSN you entered seem to be correct, you may need to paper-file your tax return this year and update your information with the Social Security Administration to prevent this from occurring in future tax years.