I used to log in to https://data.stackexchange.com by inputting my login/pass from Stack Overflow. But today, on the login page, I only see this:
But I never created accounts on Yahoo, LiveJournal, WordPress, Blogger, Verisign, or AOL.
I tried to insert my login, spelt "coeur" or "cœur", but it results in:
No OpenID endpoint found.
Note that I already have an account, with some queries marked as favorite, so I do not wish to create a new one, even if the display name is corrupted by ASCII restrictions: https://data.stackexchange.com/users/25671/cur (but, if renaming of my account is required to make login work, I'd be happy to have it named "Cœur").
Note that I'm in China, using Chrome.
I found a workaround, by manually inputting
https://openid.stackexchange.com/ in the textfield, I get directed to a classic login page that let's me log in from China.