Scholarship & American Opportunity Credit

1.  TT tells me my daughter must file tax return because she received scholarship.  This has never happened before in the previous 2 years of college.  The scholarship is entirely 100% for tuition at her university.  What did I do wrong to flag this instruction?  I did elect to claim book expenses.

2.  What section covers the American Opportunity Tax Credit?  Last year, TT provided, but it's not showing up in my return.  Again, what did I not do to receive this credit?  Daughter is still undergraduate, 3rd year junior, full time.