When you enter the 1095-A are you selecting the "Self-employed and bought a Marketplace plan" box? Do you have a Net Profit on Schedule C? Self-employed health insurance deduction goes on Form 1040 Schedule 1 line 17 then to 1040 line 10, as long as the expense is not greater than your net self-employment income. If it does exceed your net self-employment income it gets split automatically. An amount equal to your net self-employment income goes on Form 1040 Schedule 1 line 17 and the remainder gets added in to medical expenses on Schedule A.
Heres some info on the premium tax credit. It can be a convoluted calculation. Self employment health ins and claiming the Premium tax credit
Calculation of SE Health Insurance Deduction when claiming the Premium Tax Credit on Form 8962
