Problem inviting a friend (Tom Clancy's Ghost Recon: Future Soldier)

My friend and I bought Tom Clancy's Ghost Recon: Future Soldier, but I have it in English, and from a friend in Russian. So after creating a company and accepting an invitation to this company, I get the error Failed to join friend. Unable to establish connection to host. We tried to delete each other from Uplay and find each other in the game by searching (as described here on the forum more than once), nothing happened, all the same, the error flies. At the same time, when I send invitations to a friend to the company, they do not reach him, and when he invites me, they come to me, but gives an error. The version of the game for both is 1.8