This 3-year old post on Reddit says that the MCC is 5734 which is computer and computer software store
https://www.reddit.com/r/CreditCards...lists_are_not/

Retail purchases are transactions made at men & women’s clothing stores, sports and riding apparel stores, shoe stores, accessory and apparel stores, music stores, computer software stores, sporting goods stores, book stores, office/school supply and stationery stores, game/toy and hobby shops, camera and photographic supply stores, card/gift/novelty and souvenir shops, leather goods and luggage stores, artist supply stores/craft shops, art dealers and galleries, cosmetic stores, florists, pet shops, pet food and supplies, swimming pools sales and supplies, duty free stores, discount stores, department stores, variety stores and miscellaneous general merchandise stores.

It should have, but then purchases on Staples.com should count, but they don't.