Premium Tax Credit

Help - I am entering the information off of Form 1095A and once completed, the screen is telling me the Premium Tax Credit is zero. And as a result, I have to repay the entire amount received as a discount each month. I know for certain that I qualified for the tax credit because I have the documentation from the HealthCare.gov website telling me so. 

How or where does the Premium Tax Credit come from and why isn't it appearing for me?

 

Thanks in advance.

 

Brian