So I guess I was lucky previously with AC Valhalla DLC. ./shrug
Only other difference was this was a preorder, DLC was after it released.
Oh okay, news to me then! I was just going by what I've read on the Microsoft Rewarda subreddit.That hasn't been the case with me (or others here). Every code I've redeemed has worked for games that had a punch card. To my understanding Rewards just needs to see a purchase and a code is still a purchase on the store, just a prepaid one.