In this case, you may have to file your joint return by mail. Before filing by mail, though, try entering "0" as the AGI.
Since this is the first joint return you are filing and you do not have his 2019 AGI, the IRS won't be able to verify your identity using 2019 AGI information - since you were not married (or filed separately) in 2019, your and his AGI were not "linked" in the IRS's 2019 tax database.
You can file a paper return by printing out copies of your federal and state returns and mailing them. We’ll include File by Mail Instructions on where to send your returns and what forms, if any, you need to include.
And, our condolences on the loss of your husband.
