I've entered the $6,771 Dependent Care Credit, the summary reflect a calculated amount of $1,050, but the Child and Dependent Care Credit is $0 is there a known issue where the credit is not adding to the refund?

When the child and dependent care credit calculates a value, but the amount you see applied is zero, this usually means that other credits have already eliminated your entire federal tax liability.  The child and dependent care tax credit is nonrefundable, which means that it cannot reduce your tax below zero.

You verify this is the case for you by taking a look at your Tax Summary.   Here are the steps to do that:

1. Log in to your tax return at TurboTax.com.
2. Click on Tax Tools on the left side of the screen (you may need to click on Continue in the center first).
3. Click on Tools.
4. In the box that pops up in the center, click on View Tax Summary.

If you see a 0 for Total Tax, then that is the reason you do not see the credit applied.