No. If an item or expansion is currently on sale, a promo code cannot be used for an additional discount. Promo codes can only be added when an item/expansion is available at full price.
Please note that error codes will be presented if attempting to use a promo code on ineligible items:
- Error Code 80844: Attempting to use a promo code on an ineligible item on sale/already discounted
- Error Code 80817: Attempting to use a promo code on an ineligible full price item [that does not accept promo codes]