I’ve not used AirBoundaryConstruction in rhino before so this is likely user error but:
Created two rooms, solved adjacencies, selected face, went to constructions and selected the Generic Air Boundary construction in the library, and received this message:
Just to make sure you are aware of the other options you can choose the interior walls to be set to Air Boundaries when you run the solve adjacency command using the AirBoundaryOverride option.