I tried the github option, and the first time I tried, it barfed about "unauthorized credentials" or some such after the redirect back from github, bringing me

I tried the github option, and the first time I tried, it barfed about "unauthorized credentials" or some such after the redirect back from github, bringing me to another hackerrank login page. I tried it again, and it choked right away with the same message. Third time and it asks to "Confirm Submission", but hung after hitting yes.