If TurboTax is including a foreign tax credit on your return despite none of your 1099-DIVs showing any foreign tax paid, here are some specific reasons and steps to troubleshoot the issue:
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Foreign Tax Credit Carryover: TurboTax may be including a foreign tax credit carryover from previous years. If you had foreign tax credits in prior years, they might be automatically carried over
Check your prior year returns to see if there are any carryovers.
Check Box 6 on your1099 INT interest statements to see if there are amounts listed there for Foreign Taxes paid. If you have a 1099 DIV, it will be listed in Box 7. if you have amounts listed in either of these statements, then some of your interest paid is from foreign sourced income.
Other Income Sources: Check if there are other sources of foreign income, such as a Trust K-1 or other investment accounts, that might be triggering the foreign tax credit
For more information you can refer to the following sources: