If you already e-filed a tax return that was accepted by the IRS and now you e-filed again, your e-file will be rejected. The IRS will not accept more than one tax return using your Social Security number. You do not say how long ago you filed on that other site, so you will have to just wait to see which one is accepted. Or...maybe they will both be rejected....if that happens you can try to fix one of them and re-file.
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