On one of my sites I still used to log in under admin. In phpMyadmin I changed the login to a more secure one.
As expected I couldn't log in any more so I disabled the yubikey plugin, and got in the dashboard. I reinstalled the yubikey plugin, entered the api id and key and logged out.
When I tried to login I got the message "Wrong password" so to be sure I generated a new password. Tried to login : "wrong password" Disabling the yubikey plugin gave me access with that new password --> ie. seems that the yubikey locks me out.
Reinstalling via plugin install of the yubikey plugin shows the same behaviour.
Although I like this kind of security I would like to use a other loginname, so what do I need to remove / change from the database to have my new 'admin'-login working ?