I solved the issue.
After changing the "view" in the OCS console to "Show Domains" I saw that under the chlld domain it indicated that "Prep State" was "not ready". I clicked the "Prep" link and the child domain accounts are now functional.
Either I missed something in the original setup or something might not be very clear, since under the "Forest" page it showed both domains under the "Supported Domains" section making me believe that the Prep had already been done. This combined with the default view of the forest which did not include the "View domain."
Hope this helps others...