Yes, if you had a Foreign Tax Credit Carryover from 2020, you will need the Form 1116, Schedule B.
If you did not have a carryover from 2020, you should be able to Efile.
Since you're using TurboTax Online, try closing the program, clear your Cache and Cookies and review again.
Check your Foreign Tax Credit Computation Worksheet to see if you have a carryover amount shown (down towards the bottom of the worksheet).
In TurboTax Online, you will need to pay for your return and review the PDF copy (be sure to specify 'all forms and worksheets').
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