Please see this link from the IRS below. A CP2057 notice is issued when there is information reported to the IRS that was not reported on your tax return.
CP2057 Notice
You will need to file an amended return as it sounds like you agree with the notice.
You can do this in TurboTax. Please see the link below for steps to assist you as you prepare your amended return.
How to amend my return?
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