As we know, there are two login way: Github login and Wikimedia Phabricator login.
I encountered a situation that confused me, I changed my email address in the profile, and when I re-login, the site tell me “create account”.
I guess, the email address in the profile must be match the email address provided by the third party auth. Otherwise, the system will consider this a new account and need to create a new account.
So, can we login to the website with an email address as username?