After you file

https://ttlc.intuit.com/community/irs/help/i-got-a-cp11-notice-from-the-irs/00/27159

This means the IRS found a discrepancy that caused your refund to be reduced or that you now owe tax due.   No one in this forum can see your tax return, and TT does not get any information when you get a letter from the IRS.   But.....lots of people have made mistakes this year with the child tax credit or the recovery rebate credit, so that is a good starting point for you to see if that is the problem and if you agree with the change made by the IRS.

TurboTax does not get any information from the IRS after you file your tax return, so no one at TT knows why your refund was less or changed to tax due.

You have not mentioned any specific amounts.  Sometimes we can make an educated guess as to the reason for your reduced refund if you mention specific amounts--for example if your refund was short by $1400 per person---it is likely to be a mix up regarding the 3rd EIP payment.    If you received the 3rd stimulus check of $1400 per person in 2021 then you got letter 6475 from the IRS about it.   You needed to enter the amount you received.   If you already received that money then line 30 on your Form 1040 should have been blank.

  If it is short by $1800 or  $1500 or  a multiple of that amount  ---   maybe a mixup regarding the advance child tax credit payments. If you received monthly child tax credit payments of $250 or $300 per month between July and December of 2021, then you got letter 6419 from the IRS, and you were required to enter the amount of the advance payments.   Only the remaining amount of the CTC should have been on line 28 of your Form 1040.

The IRS knows how much they sent to you for the 3rd stimulus check and they know how much they sent for advance child tax credit payments.   If you answered something incorrectly on your tax return then the IRS made a correction that resulted in a reduced refund for you. 

The IRS will send you a letter that explains why your refund was reduced.   Meanwhile it might help you to check your online IRS account.

https://www.irs.gov/payments/your-online-account

https://blog.turbotax.intuit.com/tax-refunds/why-is-my-tax-refund-not-what-i-expected-49240/

https://www.irs.gov/newsroom/questions-and-answers-about-the-third-round-economic-impact-payment-top...

If you need to trace a payment that the IRS says has been issued to you, mail or fax a completed IRS Form 3911, Taxpayer Statement Regarding Refund.

Updated IRS FAQ about recovery rebate credit

https://www.irs.gov/pub/taxpros/fs-2022-27.pdf