Really? That's unusual. I'm not sure why it hasn't show up yet, but if it still hasn't shown up I'll send another one.
Edit -- It turns out it's Microsoft that processes the invites, not those of us who actually use the Invite Friends feature (it's not an automatic invite, MS has to send it). So it's a delay on their end, since they're processing invites and such, is my guess. Just give it a little time and it should show up .
Sadly it's not (full list is available here: Xbox One Backward Compatibility | Xbox), but if you feel tempted, it is a part of the Rare Replay. 30 games, $30 USD (believe it's also 30 Euros) and a lot of nostalgia if you're a big Rare fan