A few days ago, the Killer Instinct's Ranked mode was hacked and unavailable for Windows and Xbox users, noting that other multiplayer features such as Exhibition, Lobbies, and Records still work correctly. This bug prevented many players from getting a full-fledged experience from multiplayer, and the community quickly reported details about this problem to the developers.
Previously, Killer Instinct was subjected to hacking attempts, which primarily affected the rating ladder of players, where the attackers entered information about profiles that had not previously participated in online competitions. These actions likely affected the inoperability of the ranking mode in which this ladder was formed.
Today Microsoft announced on the KI official Twitter account that the issue had been fixed: league matches are working correctly, and the top 32 players' stats have been restored: