From your documentation it seems like the only thing we need to do is append access_token query param to cart permalinks which we did. The screencast made by the reviewer also shows that the order detail correctly attributes our sales channel.
We also requested collaborator access to your reviewer’s store. That store has multiple orders made from multiple channels and all of them seem to be having the same problem. Unless an order was made from “Online Store”, the channel column in orders table is empty even though in the details of the order, the order is correctly attributed to that channel.
In addition, we tested other already approved sales channels apps and they all seem to be having the same problem. Is there anything on our end we can do to fix this? Or if this is a bug in Shopify UI?