I had this exact same issue and spent a couple hours with support working on it. Bottom line is I de-selected the box that I shared the policy with someone not on my taxes and kept the check in the box that I was self-employed and bought a MP plan. That allowed me to keep the SE health insurance deduction. Also, at the federal level for 2020 the IRS is not seeking repayment of APTC so allocating the policy subsidies seems irrelevant. Indeed, my refund amount did not change when I did this. I was allowed to allocate on the state return which did reduce the amount of subsidy I had to pay back as the state did not waive repayment like the feds did. I e-filed them and they were accepted. I think the resulting returns are accurate. TT needs to support this area as it is common and by no means too complicated for them given their size and resources.
