I tried signing with e-mail, Google, GitHub, and nothing seem to work. Every time I try, the message “Oops! Something went wrong. Please try again in a moment.” comes up.
I tried today, a couple of weeks ago, always with the same result.
Curiously enough, I signed in in this forum with the same email and it worked.
I did send an email to support@freecodecamp.org and they did check that my account was duplicated, hence the problem. They merged the accounts and I recovered access to it.