I purchased Halo: Last Night and got a req code with it. After I typed it in (all annoying 25 characters) a message showed up saying that the req had been added to Halo 5, but there is no req pack in the game. I also looked under mamage game for the list of items, but no record of any additional req packs was present. I even went back and typed the code in again, and it said that the code had been used, thus confirming that the xbox registered that I had entered the code. So, am I missing something obvious, or is there a problem? Any help is much appreciated.
Have you checked here on Waypoint to see if it shows up in your inventory? You can do so here: https://www.halowaypoint.com/en-us/games/halo-5-guardians/xbox-one/requisitions/unopened-packs