The scenario here is that you have Ship to Entity/Use Code or Bill to Entity/Use Code selected at the invoice level, but it isn't applying. It is enabled in the Avatax options, but it is not being sent to the Avatax Admin Console.
Update your bundle, this feature is now supported.
This is likely due to the Ship to Select or Bill to Select pull down menus being blank. These fields can be blank even when an address is visible on the transaction, and will cause our bundle not to send the Entity/Use Code to the tax service.