If this is the error you are receiving, then a 2020 return has already been e-filed using your SSN - you will not be able to e-file an original return this year.
If you did not file your return this year, then someone else has used your SSN to file a return. This may have been intentional or accidental, but the IRS will not accept another e-filed original return with your SSN.
You will have to print and file your return by mail. You will also have to print a file your state return (if any) by mail, since TurboTax will not allow you to e-file a state return unless you have e-filed a federal return through TurboTax.
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