What do you mean TurboTax does not let you "even request it?"

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. ( you should see "Let's make sure you got the right stimulus amount”)  If you are eligible it will end up on line 30 of your 2020 Form 1040.

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://www.irs.gov/newsroom/economic-impact-payment-information-center-topic-j-reconciling-on-your-...

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.

Even if  you are not “prompted” to enter the stimulus information, you can access to the section directly by following these steps:

• Sign in to your account, select Pick up where you left off
• At the right upper corner, in the search box, type in "stimulus" and Enter
• Select Jump to stimulus
• Follow prompts

I mean, I have gone to the federal review section and was not prompted to enter any info. I have also searched for "stimulus" and am just taken to the federal review prompt.

You are going to Federal Review  and........ You are seeing NOTHING that mentions the words recovery rebate credit?   Nothing that says, 

"Let's make sure you got the right stimulus amount”  ?

Did you try this

• At the right upper corner, in the search box, type in "stimulus" and Enter
• Select Jump to stimulus

It did finally show up for me, I had to log out and back in. I had done exactly that several times. Thanks.