Ultimate Pass Free Spotify

So I upgraded my xbox live gold to the ultimate pass a few weeks back and thought i was going to get the free spotify premium that comes with it, but I haven't. Anyone have any ideas why this would be? My spotify premium account was pre-existing so would
it be because of that or is there a code i need to redeem, as i didn't receive an email about it at all so i don't know whats going on. Many thanks

:)