Elissameck,
I got that message on at least one of my seven rejection notices. Solution for me was using the Forms option (as opposed to Step-by-Step) and going into each source 1099 and in Box 8 changing any blank or various dates to 12/31/2020 and any various countries to RIC. Note there are two places for country names in Box 8, both need to be RIC. There is a box to check if from a mutual fund, mine were so I checked the box. Then review your Form 1116 itself to make sure you are using box (c) Passive category income (most of us only have dividends), Part I line i (it's before line 1) is RIC, Part II (j) is checked Paid, line (l) had a date in the format of mm/dd/yyyy. I have only tried this with passive category income from mutual funds, if you have more exotic income (some of the other boxes) then this may not help. Hopefully the steps above will work for you too.
