OK, I think I figured it out. Even a blind hog finds the occassional acorn

The yi.org website issues users an account ID and password. The setup for yi.org dynamic DNS in the server configuration asks for an account, but for the purposes of logging in to update your IP it should be the domain as registered with them, not the account ID. The password is the same as you use to logon to the yi.org account. Once I got that in place I was able to see the DNS update timestamp on my yi account change to the last server boot time.
All is well in the world of my SME server, at least for the moment.
