This article explains how to view the discounts added to a subscription, as well as determine their current status: active, pending, or expired.
How to view discounts on a subscription
Go to Subscriptions
Search for the customer name and open up the subscription
All active and pending discounts will be displayed on the right-hand side.
π‘ Hover over the discount to see when the discount is due to start, or how long is left on the discount.