Rivalate key

hiall, so i heard there was suposed to be a rivalate key in the mission pass i finished all of the mission pass and i got no key, i am trying to finish my rivalate but i cannot get a key from nowhere, any ideas where i can get 1 aside from the 800 titles since i only got 300 and i dont think ill ever get 800 titles...

That was last months Mission Pass, you can access it over the "PREVIOUS SEASON" button in the Mission Pass details if you unlocked your tiers. You can also get it as a random drop from some UQ bosses on UH. Jp also has a one time exchange for what would be the equivalent of RWB5s but we have to see if they release it on global.