When i go to World of Minecraft realms it says Connection Lost Invalid User Why? I am registered to WoM

If i connect to other server it says Ilegal Username

WTF?

 I Have premium minecraft account

I am registered to WoM

Also i tryed my other account which is free

NOT WORKS TOO SAME ERROR

Help me i cant play i hate this thing :(

Both accounts are registered in WoM