I wanted to report that I had the exact issue of the original poster: @dscek. I submitted my kids Tax Returns with their dues near the deadline last summer for 2019, and the IRS gladly and quickly cashed those checks once received, so I don't agree with the opening mail argument unless they are saying to translate from physical returns to digital, which I can understand that. So this year was the first year to e-file for all my kids, since last year was the first submittal. However, I also used the correct AGI from 2019 but they were rejected and I was able to remedy it by selecting $0 dollars for 2019 AGI, which was wrong but correct according to the IRS.
