I was able to login and reach the character screen, but when attempting to enter the world I received error 300023.
This error seemed to correspond to a local Internet outage/Xfinity issues. After Xfinity resolved the issues I started receiving this error.
I was able to resolve this issue by quitting the game on my Xbox. Note: Shutting down the console does not do this, you need to select the game, go to more options, then “Quit”.