Columbus

Hello, currently we are using IG demo account, but we plan on moving on to the real money trading in the near future. Problem we have been having is that if two people try to sign into an account using either (Two computers or Two mobile apps) it logs one of us out. We can only open one account with two devices if one of us uses a mobile app and the other computer, but is it possible for both of us to use mobile apps or computers without logging each other out. It might be that only Demo accounts don't have this feature and on real money account this is possible. If not, do you know any ways we can solve this problem? Any help would be greatly appreciated. Ivan.