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Tom Clancy's Rainbow Six® Siege X is an elite, tactical team-based shooter where superior planning and execution triumph. Enjoy free access to Quick Match, Unranked and Dual Front game modes with a selection of operators. Certain features like Ranked playlists, Siege Cup, additional operators, and cosmetics require payment to unlock.
Link your accounts and then click 'GET THE GAME'.
Got the Siege for Xbox for free when I got my Series X and we're able to play the training missions without having game pass/online. Trying solo to infiltrate embassies/airplane few times a week was so much fun.
Late last year something changed and it just keeps telling me in need game pass subscription.
Perhaps I try with my PC now, thanks OP!