The LLC is non-refundable. That is, it can only be used to offset an actual tax liability on line 18 of form 1040.
If you are eligible, you have answered something wrong, in the interview. But, a lot of people are just not eligible. See Also see this TT support article https://turbotax.intuit.com/tax-tips/college-and-education/what-are-education-tax-credits/L7TuLrVqZ
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-credits-deductions/education-tax-cre...
https://www.irs.gov/credits-deductions/individuals/education-credits-questions-and-answers
https://www.irs.gov/individuals/llc
