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Was able to submit successfully after identifying issue with turbotax for this exact issue 3 times. I compared form 1116 for last year and this year on saved PDFs and turbotax was populating "Various" for a date field (see image below).
Solution: view your form 1116 for year 2020 in form view mode and override manually value "various" to date 12/31/2020. This is a date field and should contain date value. Last year this field was populated by turbox correctly.
