You are allowed to claim the AOC on each dependent. Only $1000 of the AOC is refundable. The other $1500 (maximum) can only be used to reduce your tax liability.
If you are eligible, you have answered something wrong, in the interview. But, a lot of people are just not eligible. See https://www.irs.gov/Individuals/AOTC
It may only be you are looking in the wrong place. The non-refundable portion shows on line 3 of schedule 3 and will be blank if you had no tax liability to off set. The refundable portion (up to $1000, for each dependent, will be on line 18c of form 1040.