Console Gaming League

...because it's not a console. PC and consoles are basically in different leagues.

Decent teammates on Rocket League?

More remasters of old 90's/00's games from other consoles

Thanks for the extra info
May I know if you tried to install the remotely?

If not you can do it in two ways:
A. Download and configure the Xbox mobile app > once configured go to the search tab and type rocket league > tap on it and select “download to console”

B. Sign in with your account here
https://www.xbox.com/games/store/rocket-league/...
You should be able to see an “install” button, click on it

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If maybe the issue persist try factory resetting your console but keeping games and apps
For this go to settings > system > console info > reset and then select keep my games and apps

Unfortunately, you don't provide much information how you obtained Rocket League.

If you bought the game yourself, check
https://account.microsoft.com/billing/orders that your purchase of the game shows up there.

If you didn't purchase it yourself, it might be that someone owning the game set your console as their Home Console previously, so your console unlocked the game that someone else owned for you. If that person removed their Home Console sharing from your
console, you can't play that game anymore, as the console can't unlock it.

Also: Rocket League is currently in Xbox Game Pass. Maybe your Game Pass membership ran out, and you can't play Rocket Leage because of that.

And finally, in the past there had been free play days for Rocket League. Maybe you got it back then for free for just those days, and since the free play days are over, you can't play it anymore.

rocket league is pretty fun. can play online or offline with 2 or more people being on the same console and it's not too expensive of a game either