Update for 2012 to 2014 only seems to go ok !

I can login via client, Webacc and GWIA receivng emails

I have SR open for Directory Sync problems but I thought rest was good to go !

But, whilst I wait I need to Create a couple of new users who started today

When I try to create a new user I receive an error Invalid Post Office & nothing in the drop down!

What have I missed