TurboTax saying I am not eligible for American opportunity credit - my son first year college and I am under the $ threshold-am I filling out wrong?

Form asks who is the student - I put my son,  the amount of payments to the school,  and zero for scholarships as we are applying the pell grant to room/board since he has no income aside from that.   When I fill out a paper version of form 8863, I qualify for the credit - so why not with turbo tax?