Using A2X integration - having issues with Tax

Hello all -- I am using an A2X accounting integration to transfer sales and fees from the marketplaces I sell on directly into my Sage accounts.  I am getting an error message when trying to send that data to Sage that the system cannot find my Tax rate.  I use an external tax software so I have both Sage and the A2X system set to "no tax" but for some reason it will not work.  I am just coming over from Quickbooks where this was a non-issue... hoping someone in the Sage community has run into this and can provide a suggestion on how to resolve it.

Thanks!