The error in the logs is: Object Name error: An error occured while creating object ObjectName: The object 'cn=Object Name,OU=ADOU,O=Organization' doesn't exist
Tests run with "Do not commit changes" selected produced success results (mentioned that it would create the object).
When "Do not commit changes" was unchecked the error stating the object doesn't exist would appear.
Increase permissions to the Domino directory to Editor or above as per documentation in the CMN_3.X_UserGuide.pdf
Step 2: Configure LDAP to permit Domino read and write access for CMN’s Directory Connector
To configure LDAP for CMN’s Directory Connector:
1 In the Domino Administrator, on the Configuration tab: In the navigation tree at left, expand Directory, then expand LDAP, and then select Settings.
If you already have an LDAP configuration document, Domino Administrator will open it into the window at right. If you do not, Domino will prompt you to create one.
NOTE: The LDAP configuration document you edit or create here will not replace your existing Domino configuration document. Domino will simply draw the new/updated LDAP configuration settings into your existing configuration.
2 In the LDAP configuration document: Click Edit LDAP Settings.
3 If you will configure any Exchange-to-Notes connectors: In the LDAP Settings, set Allow LDAP users write access to Yes. (This step is unnecessary if you will configure only Notes-to-Exchange connectors.)
4 If configuring a coexistence with a Domino 6.5.x server (only): You must also disable constraint checking on LDAP writes.
5 Save & Close the document, and then restart the Domino server.
LDAP writes to the Domino directory also require that the directory ACL have the Maximum Internet name and password set to Editor, and have all Roles selected (checkboxes marked). These settings act as a global filter that everything must check against.