Someone else must have filed your ssn or another ssn you are claiming. Do you have a dependent that might have filed their own return? Or someone might have claimed you? It could be an accident and someone else typed their ssn wrong and got yours. All you can do is mail your return and let the IRS figure it out.
How to switch from Efile to mail. This one has a Video
https://ttlc.intuit.com/community/print-and-file/help/how-do-i-switch-from-e-file-to-file-by-mail-in...
How to mail a return from the Online version
https://ttlc.intuit.com/community/printing/help/how-do-i-print-and-mail-my-return-in-turbotax-online...
Be sure to attach copies of your W2s and any 1099s that have withholding on them. You have to mail federal and state in separate envelopes because they go to different places. Get a tracking number from the post office when you mail them for proof of filing.
Where to mail federal paper returns
https://www.irs.gov/uac/where-to-file-paper-tax-returns-with-or-without-a-payment
