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Your 21 year old daughter was a dependent on your 2019 tax return but was older than 17 and does not meet the criteria of a qualifying child.  I suspect that she filed her own 2019 tax return as a dependent.

Your 19 year old daughter was a dependent on your 2019 tax return but was also older than 17 and does not meet the criteria of a qualifying child.

See this IRS FAQ under Who is a qualifying child?

Who is considered a qualifying child?

A qualifying child is a child who meets the following conditions: 

• Relationship to the individual who’s eligible for the payment: The child is your son, daughter, stepchild, eligible foster child, brother, sister, stepbrother, stepsister, half-brother, half-sister, or a descendant of any of them (for example, grandchild, niece, or nephew).
• Child's age: The child was under age 17 on December 31, 2019.
• Dependent of the individual who's eligible for the payment: The child was claimed as your dependent on your 2019 tax return or in the Non-Filers: Enter Payment Info Here tool.
• Child's citizenship: The child’s a U.S. citizen, U.S. national, or U.S. resident alien.
• Child's residency: The child lived with you for more than half of 2019.
• Support for child: The child didn’t provide over half of their own support for 2019.
• Child's tax return: The child doesn’t file a joint return for the year (or files it only to claim a refund of withheld income tax or estimated tax paid).

Since your older daughter will not file as a dependent on the 2020 tax return, she is eligible for the first and second stimulus payments.  She will receive the payments in the form of a Recovery Rebate Credit on line 30 of the 2020 Federal tax return when you file.

TurboTax will compare your one or two stimulus payment amounts to the computations within TurboTax.  The computations within TurboTax are based upon the information that you have entered into the tax software.  If you are due an additional amount, it will be issued as a Recovery Rebate Credit (RRC) on line 30 of the 2020 1040 tax return.

In TurboTax Online, you are prompted to input stimulus check 1 and stimulus check 2 information under Review down the left hand side of the screen.  You can access your stimulus check choices by following these steps: 

• Down the left side of the screen, click on Federal.
• Across the top of the screen, click on Other Tax Situations.
• At the screen Let’s keep going to wrap up.  Click on Let’s keep going.
• At the screen Let’s make sure you got the right stimulus amount, click Continue.
• At the screen Did you get a stimulus payment? you can update your stimulus check entries.

If your younger daughter files a 2020 tax return as a dependent, she is not eligible for the first and second stimulus payments.