If you enter all of your itemized deductions in the Federal section, TurboTax will flow them through to the state return. You will enter any adjustments needed for California in the California interview.
Review your California Schedule CA to see how your total itemized deductions were calculated. California has an upper income limit for claiming itemized deductions.
I had forgotten that both Federal and State Itemized Deductions are reduced if you exceed an AGI threshold. The software used to have a call out when your deductions were reduced, but not now.
Resolved with the help of Turbotax Social Media Customer Support on X (Twitter). Thanks to Dylan and Dennis S. The many related responses on this forum that repeat that the program picks for you are, at best, unhelpful.