Invite issues

Hi, star wars people.

Me and two other friends I play with, we use EA,  have a issue that make us unable to invite each other to party from in game. So we have to make one be in game, and the other have to quit the game and get invite and click: join party and launch option . Also we all get the one error code when trying to connect online in the game, 721 I think. Is these known issues and is there a fix?