I have bought game pass so i can play rainbow six siege, it prompts me to buy game pass...

Hey Ricardo, it’s just one game (rainbow six siege) that won’t let me play, all my other games I can play, online as well which means my gold still works and my buddy who bought the one game(rainbow six) he can still play it on his console. But since I bought the game pass it the Xbox thinks I don’t have rainbow six and I’ve been playing it for 2-3 years, now after game pass running out it won’t let me play

Rainbow Six Siege was part of a "Free Play Days" promotion because of the esports finals that were going on last weekend. With "Free Play Days" you can only play the game for a certain amount of days, (usually a holiday weekend). After the days have passed,
you can no longer play the game unless you buy the game either at a retail store or the Xbox store. Rainbow Six Siege is currently on sale for 50% off ($30.00). I hope this helped

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Which Game Pass did you buy? Do you own the game?

Rainbow Six Siege is not included with Game Pass Core.

I bought Dead by Daylight for 32$ and it says that I will need to pay an extra 16.99$ for a month of game pass just to play it for one month

yea thats so unfaır toda ı bought tom clancy rainbow six siege for 9,99 and want to play but stıll want gampaas thats not make any sense like i would buy just gamepass and can play r6