On a whim, I tried entering the 1099-DIV manually (instead of importing it). When I did that, it let me enter the US Government interest. Workaround discovered.
TurboTax only asked for one AGI, I did not see anywhere to enter separate AGIs for each of us. In any case, our 2020 return shows only one AGI, the joint AGI. I...
I got rejected both with the correct AGI and when entering 0. The rejection notice said:The IRS couldn't confirm <spouse>'s identifyIt looks like the AGI amount...