If you tell us your taxable income on your paycheck (sometimes "FIT taxable" or something) we can tell you how much you should have withheld. If you put your gross income in the IRS calculator and it said $400, it's very possible you have >$400 in deductions so your tax will be $0.

Well, let me just do this: for joint filers with 2 children under 17, a $62,700 income for 2022 results in $5 in tax. So if you make <$62,600/yr or so, your withholding should be $0. At $66,000/yr, federal tax liability is $401.