Unfortunately, there is no way to contact the IRS and ask/suggest for alternative methods to electronically file this year. The e-file procedures adopted by the IRS for 2020 are in place and are not going to get changed.
If you filed your 2019 return late last year (after mid-November) or your return was processed after that time - try entering "0" as the AGI. The 2020 IRS e-file database will not have the AGI from your late-filed (or unprocessed), but may accept a 2020 e-filing using "0"
In my case (paper joint return filed in March of 2020 and received - check for payment sent with return was cashed and is reported by IRS - but return still not processed) submitting 0 for 2019 AGI was again rejected, but after I entered 0 for spouse's AGI and resubmitted, was accepted. So, if filing a joint return and 2019 return still not processed, to have success filing electronically you can try entering 0 for both spouses' AGI. Worked for me, YMMV.
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