When you say sync users for VM, I assume you mean LDAP. So, can you access CU Admin using the application administrator user you created during installation (ex: ccmadministrator, cuadministrator...people use various names for the app ID).
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...