Can't Delete Alliance

So I need to delete my alliance, as you can probably tell by the name, but I'm having issues.

I log into my Call of War account through Facebook and in order to delete the alliance you must confirm by entering your account password. I've tried both my forum password and my facebook password but both result in the same thing, "Authentication failed, incorrect password"

I don't know what I'm doing wrong.

Definitely not mistyping the password