Just in case someone else has the same issue here’s my solution. My host (bluehost) had a plugin installed that interfered with the setup process. I deactivated it and it installed just fine. That said, I’m now seeing draft orders and test orders that aren’t paid, being automatically imported into Sellbrite as paid orders. That is a deal breaker for me. I need to trust the orders in Sellbrite. I really really really don’t want to be shipping product for non-paid orders.