Activation on the Microsoft website https://redeem.microsoft.com this code is for the Microsoft platform and if you play through Steam you must have Steam accounts associated with Microsoft
A note for Steam users with Gamepass Ultimate
Please note that should you redeem a code on the MS store but use Steam as your main platform - your redeemed content will not be visible until you launch the MS Store version of the game either through your Console, the XBOX App, or via XCloud. Please Note: When using the XCloud Gaming service, if on Windows, you will need to use a supported controller to progress past the ´Start Game´ screen to receive your items. If this is not available, please use the Xbox Game Pass phone app where you will be able to use virtual controls.