Yes, the 'sharing' of a Marketplace 1095-A and a deduction for self-employed health insurance are unsupported calculations in TurboTax (item 6 under Health).
Your options are to either mail your return, or to do as you did, and opt to forego the self-employed deduction.
Obviously, you could not report the 'sharing' but this could impact either/or/both your return and the other person's return.
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