The IRS gets it from Social Security. So you need to check with SS. Guess you have to print and mail it.
Your name, Social Security number and date of birth are all received by the IRS from the Social Security Administration.
Most likely, the IRS has the wrong date of birth on file. In this scenario, you won't be able to e-file because the date you're entering doesn't match their records.
Tip: To prevent this rejection next year, call the Social Security Administration (SSA) at 1-800-772-1213 to verify their records (this is where the IRS database pulls from). If the info is wrong, please allow 4–6 weeks for correction.