Free Stuff for Game Pass Ultimate members!
First off sorry for the grainy image Xbox does not allow for screen capture on the Home Screen.
>Free 3-day Affinity and Credit boosters, 1 Orokin Reactor and Catalyst, 1 Warframe Slot, 2 Weapon slots and Excalibur Immortal skin.
Unfortunately it seems that it can only be redeemed on an Xbox consoles according to the fine print on the bottom. But just check the Game Pass Ultimate Perks and it should be there waiting for you.