Fifa’s 14-17

Hi guys i was just curious and need to know that i just bought an xbox series x mostly for old games i was looking into the microsoft store and saw fifa’s 14-17 were there but it says it’s unavailable why is that i understand that the servers are down but i still want to buy them and play them i also bought a disc version of fifa 14 from xbox 360 and it says that it is not playable on the xbox series x and now i started regretting buying the xbox series x. I bought it mainly for these fifa’s and some other old games.