What matters is what the 5695 instructions say and how you interpret them as applied to your own case rather than the questions that turbotax asks you and how you answer them. In my view this is at least somewhat subjective. I think If you have joint occupancy, shared the cost for the energy improvement, and are each claiming part of the credit (so it is allocated), then you need to have box 32a checked and I don't think TurboTax supports electronic filing in this case as the return will be rejected and this is on TurboTax to fix.
On the other hand, if there is joint occupancy, only one person paid for the energy improvement and the credit is not allocated between occupants, then 32a a does not apply and TurboTax does support electronic filing (as a supporting document on how credits was allocated is not needed).
The bottom line is that the credit is claimed appropriately as long as the other occupant did not pay for the energy improvement and does not claim any credit in which case the joint occupancy effectively "does not apply" on line 32a.
