Form 1116 Schedule B can't file

Hi there, I filed my taxes about a month ago and realized I made a mistake with my foreign income. I have been trying to amend my return and to claim the foreign tax credit (which was finally available today), but when I get to the end I get this message and it won't let me file. It looks like I will have a carryover in 2022 (2021 is the first year in which I have foreign income) and that's why I need schedule B, I guess? But what does the message mean? That it will be available at some point just not now? I saw online that schedule B will only be available for Print and not fo E-file. What does that mean in practice? That I can still fill out everything online and then I just print out that extra form and mail everything? 

Thanks so much.

 

 

screenshot.png