The stimulus check is an advance on a credit you can receive on your 2020 tax return. If something went wrong or you did not get the stimulus check in 2020, you can get it when you file your 2020 return in early 2021 The Recovery Rebate Credit will be found in the FEDERAL REVIEW section.
Make sure that you enter ALL of the stimulus money received for the 1st ad 2nd stimulus for yourself, your spouse and your children.
https://ttlc.intuit.com/questions/1901539-how-do-i-preview-my-turbotax-online-return-before-filing
Click on Tax Tools on the left side of the screen. Click on Tools. Click on View Tax Summary. Click on Preview my 1040 on the left side of the screen.
If you follow the interview then everyone who is not being claimed as a dependent will be asked about the advance stimulus payments ... this is right after the Other Tax Situations tab as you enter the Federal Review tab ...
make sure you are not clicking that you may be claimed as a dependent on someone else's return. It will by pass those questions. If you are then you will not be able to claim recovery on TT online.