Thank you for the fast response!
So basically, we tried changing WiFi connection or using a Vpn, however at first it still didn't work but at some point it fixed by itself
Hope it won't bug again, if so I'll try to report through the link.
My friend and I started playing online two days ago and we were doing just fine but then, today the server wouldn't let us play because we are "in the same location" and it would insist on the premium membership. Do anybody know if there was a kind of "trial" that has expired aft...