Can't resell tickets donated for resale

Hello - I'm using the Web/Cart/{sessionKey}/Tickets/ReturnWithSeat endpoint - what is the setting in Tessitura that I need to change in order to actually resell the seat after it has been returned? Right now I'm getting the same error as in this post, but the solutions suggested don't work - the seats just come back as unavailable, and I don't know why, nor do I know how to make them available. 

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