If you reported the excess employer contribution and subsequent withdrawal on your 2021 taxes, TurboTax would have automatically added the $2,400 as additional income. This would show up on Schedule 1 Line 8e, which goes to Form 1040 Line 8. There would have been no 6% penalty.
If you took the excess distribution in 2022, next year you will receive a 1099-SA for the $2,400 plus any earnings. Any earnings will be taxable income, but will not be reported until next year.