Inventory data that's received from a Mac client computer may not be processed as expected on a Configuration Manager (ConfigMgr 2012) site server. Additionally, an error message similar to the following is logged in the SMS_DM.log file:
Send status message: DMPMSG_ERROR_CLIENT_CERTIFICATE_PROBLEM
An existing device CN=User_name needs to re-register.
This error is generated even though the client certificate is correct.
If you experience this problem, a supported hotfix is available from Microsoft Support to address this issue. For complete details please see the following:
3155424 – Mac inventory data isn't processed in System Center 2012 Configuration Manager (https://support.microsoft.com/en-us/kb/3155424)
J.C. Hornbeck, Solution Asset PM
Microsoft Enterprise Cloud Group