When you receive a Notice CP22A from the IRS, they have made a change to your return. See this IRS webpage for more information about CP22A and how to respond.
If you agree with the changes, you should pay the amount due.
If you disagree with the changes, follow the instructions in the notice to contact the IRS.
TurboTax calculations are guaranteed. If your situation meets the terms of the 100% Accurate Calculation Guarantee, Intuit will reimburse the amount actually paid by you to the IRS or state in penalties and/or interest (not the tax) as levied against you in their first notice (i.e., if the notice is not paid, Intuit will not reimburse additional interest and penalties for not paying the first bill timely).
Claims can be filed online here. If you file a 2024 claim and the drop-down menu of years doesn't show 2024 yet, you can choose "2023" and the Accurate Guarantee team will consider your claim.