Double check your entries in the section Deductions and Credits > Retirement and Investments > Traditional and Roth IRA Contributions. As you go through this section, first indicate that you have a Traditional IRA.
Then, enter the amount that you contributed for 2023. There may be some follow-up questions related to whether you want to deduct the contribution or keep it non-deductible, as well as questions about previous year non-deductible contributions. If you see a message that you cannot make a deductible contribution, then the contribution you entered is automatically considered to be non-deductible and will be reported on line 1 of Form 8606.