If you are not getting an e-filing error when you go to e-file, you can mail Form 843 separately so that your return does not get into the backlog of mailed returns waiting for processing. Since your Box 4 amounts are correct, you might not receive an error. The link above has both the form and the instructions. Form 843 is not supported in TurboTax, so it has to be mailed either way.
The total of Box 4 for a single employer should not exceed $8,537.40 per taxpayer for tax year 2020. The numbers in the FAQ instructions are not updated for 2020 yet.....
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