so how we gonna fix it then i have same problem with 520 but i cant connect to microsoft account
Nothing you can do until Microsoft fix it. Do NOT hard reset or reinstall firmware, this will not solve the problem because it has nothing to do with your device.
Well, I did a week ago a hard reset on my Lumia 625 just to start fresh with it and install for the last time all apps I'll use on the phone before the Store goes down. And I didn't know I can no longer sign in with my account.
So, what could be the problem? It's Microsoft related of they already dropped the support?