If your refund didn't change, then before deleting anything or starting over, it would be best to view your tax return and look for the credit. You should also look for the worksheet. To view your 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. Keep in mind, the credit is partially refundable and there is a calculation that determines how much you will receive.
Here's some more information about the American Opportunity Credit.
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