Hey all. Whenever I attempt to join any minecraft server, it says 'Not authenticated with minecraft.net.' This began yesterday, when I changed my username back to EnderMagic1.. :/ How do I fix this? I need to claim that new promo! (I use Windows btw)
As Tuq said, you need to log out from your EnderMagic1 account and log back in with your current username/email and password. If it says that EndermanMagic is logged in after you do that, you're good to go.