"Accepted" does not mean your return was correct or that the IRS will approve of your refund. Accepted only means you entered enough data for the IRS to take in your return for processing. TurboTax is not responsible for any errors that users make if users enter wrong income, leave out income, enter wrong information, etc. etc.
If your refund was not reduced for a debt you owed like child support or back taxes, then check lines 28 and 30 for mistakes with the recovery rebate credit or child tax credit. Lots of people have made mistakes with those credits for 2021.
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.
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.
Or---the fees you were supposed to pay for using TurboTax + the "refund processing fee" charged by the third party bank….
Did you choose to have TT fees deducted from your Federal refund? (Remember that if you did that, you also agreed to an extra refund processing fee of $39.99 or $44.99 in CA)
How can I see my TurboTax fees?
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.
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.