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If you really want to use an external data store for the Configuration read https://wikis.forgerock.org/confluence/display/openam/Configure+an+external+OpenDJ+or+OpenDS+as+the+configuration+store
User Data Store Settings
The OpenAM data store is not supported in the production environment per the wizard.
Other User Data Store = selected
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SSL/TLS Enabled = no
Host Name = opendjopendj0.krypton.com
Port = 1389
Root Suffix = dc=krypton,dc=com
Login ID = cn=Directory Manager
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