Hi
For Express envionment there is no need to install the Authentication and Privilege components Access Manager.
We are sorry the guide you found from the Express documentation is not for Express version of Linux, we will contact our internal team to work on this link and point it to the correct document.
https://docs.centrify.com/en/css/18.8/centrify-express-linux-agent-quickstart.pdf
Above is the Express for Linux and Unix quick start guide.
As per the operation on Deployment Manager there is a History node to record all of the activities, right click on Analyze operation for this server and you will find the Trace details in it. The result will also tell you if it's success or not. Also the new added computer will be listed under the Computers node, there is a History node for specific server.
We could transfer the discussion to the support ticket with email communication - If you would like to further troubleshoot the issue on DM with sensitive data captured.
Thanks,
Amy