I had a slightly different message "IRS1116-ForeignTaxCreditSource-USTaxWithheldOnDividendAmt - Data in the return is missing or invalid. Please double check your entries.". It didn't even mention date and TT said no errors, but date was the issue. Changed "various" to 12/31/2020 and it was finally accepted. Thanks for posting the solution!
I had another problem with the Foreign Tax Credit in step-by-step. Mine came from 3 stocks from 3 foreign countries. TT SBS would ask for a list of the countries, but then would only accept data for one country. I had to fix it in the actual form.
