Why am I not getting an Education Credit?

I'm surprised I'm not getting an Education Credit.  My wife and I seem to meet all the criteria.  We're filing jointly, we're not over the income limit, and we're paying for two kids in college.  My second daughter has $58K in box 1 and $53K in box 5 on her 1098-T.  My first daughter graduated in May, and married in June -- so she's no longer a dependant.  Not sure if that might have something to do with it.  My first daughter's box 1 is $6,552, and box 5 is $777.  My first daughter had $12K of student debt when she graduated, and we took money of out the 529 to pay-off that debt.  Not sure if that might be the problem?  We/my first daughter has likely already received the credit 4 times.  Maybe that's the problem?