"Your client's federal return is not eligible for electronic filing for the following reason: All earned income for the Earned Income Tax Credit (EITC) is calculating from undocumented sources" 

I thought this was an error early in the season when you chose to use the Lookback for EITC....I coulda sworn they fixed it though, I havent seen anyone mention it since back in March. 

You may want to try and use REPAIR updates from the Windows Programs menu under the PS 2020 heading.