What this tile shows
The uncomfortable half. These are people who would likely have bought anyway, so every discount here is margin given away.
Squizzie calls this one Returning Customers Using Coupons. It reads as a single count.
Where the number comes from
WooCommerce Orders. Order data including revenue, counts, and averages.
What you need for it to appear
Nothing beyond Squizzie and the shop data it already reads.