@5clark5
If you couldn't file with either TurboTax or FreeTaxUSA, then it's not a bug in the tax software. There is nothing that "they" have to fix.
You cannot e-file a 2020 tax return now. The 2020 tax return will have to be printed, signed, and filed by mail.
Since the 2020 tax return has not been filed, you have to enter zero as the 2020 AGI in order to e-file the 2021 tax return.
Since your father-in-law passed away in 2021, your in-laws should be filing joint returns (married filing jointly) for both 2020 and 2021.
If you are still unable to file the 2021 tax return, post a new separate question of your own. Do not continue tagging on to this very long two-year old thread. In your separate new question, describe all the details of your problem. Do not assume that anyone reading your new question has seen these posts here. Also include the entire exact reject message that you are getting, word for word, including the code.
