Assignment asks for authentication but that doesn't work

[cbeving]

I have a teacher who has posted an assignment and they are getting this message. They are then unable to authenticate it.

When I click on the link for "Which character are you", it takes me to the site and nothing shows up. It only says the page is unresponsive, when I reload it says the page doesn't exist.

And

The page it takes me too says I need to authorize my account and everytime I try to authorize it, it says authorization failed. 

I asked this student if he was signed in with any other accounts. He is not.