Just following up with what worked* for me. I entered paid date of 12/31/2020 on the 1116 worksheet. No override needed, and I thought you couldn't have any overrides if you were efiling. This was after applying the 2/27/2020 program update. In years past, I used Various and that is what appears on the printed out form for filing.
What makes this a bit hard to follow is that Turbotax doesn't show you the actual Form 1116 when in Forms View. You have to "print" the form to a PDF to see exactly what the form would look like. Further, I read somewhere that while Various is appropriate to use if paid on different dates and that can be used for paper filing, Turbotax is supposed to convert it to the last date of the tax year if efiling. And that may be the piece that isn't working.
* I should note that my return has yet to be accepted, but it was no longer being rejected for the reason cited in this thread. It still has a similarly mysterious issue with a non-existent inherited IRA which is subject of another thread.
