The reject code IND- 511 is "This return has been rejected by the IRS because the taxpayer's Social Security Number (SSN) has been listed as the spouse SSN on another tax return with filing status Married Filing Separately."
To correct this first verify that your SSN is accurate, if so then the filing status on your return will need to be changed. Someone else has filed you as their spouse on a Married Filing Separately return, your filing status on this return cannot be Single, Married Filing Jointly, or Qualifying Widower.
If you feel that this reject has been received in error, and you do not want to change your filing status, you may print and file by mail.
https://ttlc.intuit.com/replies/3401713
