Can you please clarify, was your 2020 tax return submitted and rejected by the IRS or are you trying to make a correction on your 2020 tax return which is a amended return?
The issue could be that you need to print and mail in the tax return as e-file may not be available.
For more information, please see the link below:
Can I e-file 2021, 2020, or earlier tax returns?
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