Segments or tags are not showing up in Shopify

The app writes its results back onto the customer record (segment, churn risk, VIP probability, total spent, total orders and RFM segment), so a customer analysed inside the app but showing nothing in Shopify has not had that write-back run, or has not had it run since their score last changed. Re-run the sync and re-check the customer in Shopify rather than in the app, since the app can be correct while the write-back is stale.