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We had this same issue.  When looking at my transcript, I noticed that I, the spouse, was listed as single on the last stimulus payment.  I have no idea why that could have happened because we've been filing joint returns for 40+ years.  Grasping at straws, I guessed that if I'm now single, I must have had had zero income last year.  So where they asked for the spouse's 2020 AGI, I entered zero and it worked!!!