Cannot open any map

"Failed to contect to instance".
Bug Report ID: #2,541,174,726

Impoissible to play.
Farming uber atziri, every time I try to re-enter it fails and logs me out.
I've tried 8 times on 4 EU servers.

An open instance can't be transferred to another server. If you opened the instance on, say, London, it will remain there. Even if you switch servers, as soon as you try to go to that instance, you will be sent to the London server again. As long as that server is down, the instance won't be accessible.

I had the same issue yesterday with London. My advice if you don't want to lose your instance or any portals leading to it: stay on the broken server and repeatedly try to log in. Once you can log in, it's safe to go back into your map. If you login to another server you might be able to access your hideout, but you lose a portal every time you try and fail to enter you map (bcs it's still on the broken server). If you stay on the broken server you don't need to waste a portal to find out whether it's back or not.