I have never got OpenAM working with OpenDJ for the configurationd data store even following these steps.
Another bug in a sense. Carefully reading the manual, "if you decide to use an existing installation of OpenDJ for configuration data, then you must first relax the restriction on objects with multiple structural object classes, by using the OpenDJ *dsconfig* command before completing OpenAM configuration".
Enter this into the command line
cd /opt/opends.0 ./dsconfig -h opendj.tin-pham.com -p 4444 -D "cn=Directory Manager" -w ****** set-global-configuration-prop --set single-structural-objectclass-behavior:warn -X