My main computer was logged in with some sort of long lasting cookie but I could not log any other device in. I tried everything I could, using the same password remembered by my browser, but nothing worked. Finally I logged out, tried to log in again and it didn't work from that browser either.
So I sent a password reset link and no matter what I type, I get "Unable to complete your request. Please try a new password." So now I am locked out.