This keeps happening to me now, I got a Legendary Req point boost and the only requirements it had was to finish a game of Arena so I done that and what did I get nothing ?!?!?!?!? This happens a lot with other Req boosts as well! Anyone get this issue ? 343 need to sort this issue out!
Are you sure you get nothing? It gives you a boost to your req points earned. The end game stats give you a run down of what you get in point and XP.
Same shiot happened to me and my friend. It only effects arena req boosts. warzone boosts are working fine for me.