Turbo Tax not allowing me self employed health insurance deduction. Sch 1 Line 29 can't be filled out. No explanation. Does i401K preclude SE Health Insurance? Crap.

Followed instructions in Turbo Tax Help Center - went to Business > Other Common Deductions > Health Insurance and put in the amount. Finish with business and it shows $0 for SE Health Insurance deduction. Click on Update SE Health Insurance and there's a paragraph saying no portion is deductible. Is it because I'm optimizing my i401K contribution on Sch C income? Cannot override Line 29 on Schedule 1. Can't write anything in that block. Double clicking goes nowhere. TurboTax not giving any explanation. Quite the opposite. Everything I read says I'm due this deduction. Have taken in previous years. Did not take in 2017 as premiums were paid by Flex Plan. Most premiums paid by Flex Plan in 2018 until I ran out of funds and had to pay by bank draft. In 2019 my payments will be much more substantial. I made a profit, well above the premiums paid ($12K vs $1K). Mp explanation from TurboTax and asking community instructions and answers just simply aren't working. As always, some part of TurboTax just doesn't make sense, doesn't work and leaves me high and dry.