This is weird. I sign in with GitHub and I get this message:
I try to login with the account I set up trying to join C9 (which is through AWS since Amazon owns C9 now apparently) and it didn’t recognize the credentials. It says my email isn’t registered with them, but I can login just fine through the original portal which was this:
There also doesn’t seem to be a way to sign up “directly” with C9. I’m stuck.
EDIT: It seems like signups directly through C9 are now closed:
But again, my credentials with AWS don’t seem to work to login through the link you provided.
EDIT2: Following some steps provided by AWS to sign up specifically for C9 just led me to a “enter your credit card info” landing page.