https://www.change.org/p/ubisoft-bring-ghost-recon-phantoms-back create a contacting technical support with a request to return the game https://support.ubi.com
(If there is no option of bringing it back - GRP could also appear like a Pay to Play = Host-Guest kind of game - Like Payday 2 is, you have all maps in your PC, and you are "getting loaded into the Host's lobby", so there is no need for SERVER. HOST IS SERVER.) petition + contacting technical support, should help us to return the game