Ground war and invasion connection issue in modern warfare 2

paid full for the game but I am unable to join ground war and invasion in modern warfare 2. ironic as it is the reason why I bought the game.

Hi,

Blizzard can only help with installation or update of games made by Activision; if MW 2 is completely installed, you will need to contact Activision Support or use social media groups such as Reddit.

For details, see: Having Problems with Call of Duty? Read this first!