More information is needed for someone to comment. I'll ask some questions folks will need to know to assist you.
Form 1040, Line 12 is "Standard deduction or itemized deductions (from Schedule A.)"
Did you manually choose to have TurboTax use itemized deductions instead of your standard deduction? If so, why? Also, if you elected that option (such as married filing separately), is there not a Schedule A in your return?
What is your filing status? Single, married filing joint, married filing separately, head of household?
ADDENDUM NOTE 1/01/2024 at 11:25 PM Pacific:
For another possibility, also see the information that @ VolvoGirl left you in her comment below if you were a dependent.
@ jamerson herr
