I had my e-file rejected yesterday. The AGI from 2020 was correct. Turbotax representative suggested that I use zero, and that solved the problem. The problem may be caused not by Turbotax entering your wife's AGI as zero, but something more mundane. It is possible that given the delay in the filing deadline last year, due to COVID, and reduced processing employees (also due to COVID), tax returns filed by mail (such as my 2020 return), and possibly tax returns that are e-filed, are simply not getting processed quickly. If someone's return has yet to be processed, the AGI would show up as zero. That is what happened to me.
