If you are trying to play online, the official multiplayer servers for NBA 2K21 were shut down on December 31, 2022 . You can still play the various offline modes if you have the game files.
NOTE: All multiplayer servers for NBA 2K21 will be shutdown as of 12/31/2022. Steam Community PGA TOUR 2K21: Server Sunset - 2K Support NBA.2k21.part04.rar
It looks like you're dealing with a for NBA 2K21 . If you are trying to play online, the
: Keep in mind that a full installation of NBA 2K21 typically requires about 110 GB of free disk space. NBA.2k21.part04.rar