I don't have a form 2210 from my CPA from last year. I'm not sure what to put into the 2210 Line D withholding

If you are using TurboTax and your return shows a tentative Underpayment Penalty, visit or revisit the Underpayment Penalty section under Other Tax Situations and answer the interview questions rather than separately filling out Form 2210. The penalty calculation may change based on your answers, including information about when your withholding was applied. 

If you made estimated or quarterly tax payments in 2024 toward your federal, state, or local taxes, enter them in the Estimates and Other Income Taxes Paid section.

In addition, if you believe you qualify for a waiver of the penalty, you can request a waiver in that section.

The IRS may reduce an underpayment penalty if any of the following apply:

• You or your spouse (if you file a joint return) retired in the past 2 years after reaching age 62 or became disabled and you had reasonable cause to underpay or pay your estimated tax late. See Waiver of Penalty in Instructions for Form 2210PDF.
• You had most of your income tax withheld early in the year instead of spreading it equally through the year. 
• Your income varies during the year. Complete Form 2210, Schedule AI, Annualized Income Installment Method PDF(found within the form).

The penalty for underpayment of estimated tax can also be removed to the extent that the underpayment is the result of a casualty, local disaster, or other unusual circumstance such that it would not be fair to impose the penalty.

See here for information about different TurboTax tools you can use to calculate withholding and estimated taxes.

See this TurboTax tips article for more information about Form 2210.