IRS says 1040 stimulus miscalculation. How to fix?

[Greg Nauman]

On my 2020 tax return it asks the questions about dependents and she did not qualify anymore so turbo tax marked her as no longer a dependent 

I would guess it’s because she is no longer in college. 

Now if the IRS went off my 2019 return it very well could be she was listed as a dependent 

That may be what happened. 

I’ll look at my 2018 and 2109 returns and see 

[VolvoGirl]

Forget about the questions Turbo Tax asked.   Look at your actual 2020 tax return.   Are both daughters listed?  You don't get the Child Tax Credit for over 17 but you might have still claimed her as a dependent.  Even if she was over 23 and not a student you can still claim her if she made less than $4,300 income not counting Social Security.