I have attempted to add another login method, LiveJournal.
- Created a LiveJournal account (backuplogin.livejournal.com)
- Made sure I'm logged in to SE and LiveJournal.
- Went to user profile > edit > my logins > add more logins...
- After clicking "Log in", the page refreshes, showing me the same form, only without the username. No error message, and no new login.
Encountered here on Meta, and on Stats.SE. In Chrome and Firefox. Using http. The "backuplogin" OpenId is not associated with any SE account.