A 2020 tax return cannot be e-filed. The only way to file a 2020 return is by mail. If you prepared your 2020 federal return using TurboTax then you can use the CD/download software on a full PC or Mac to prepare a 2020 state return.
https://ttlc.intuit.com/questions/1900990-how-do-i-file-a-prior-year-tax-return
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