What is your SEPM version?
Similar issue i was faced in the past which is because of image systems. Image system is installed with inculded of SEP client without following the process. This can create the dulicate hardware id on multiple systems. Due to this client reflect online but not be communicate to SEPM and not reflect on SEPM.
Follow this article for repair it
How to repair duplicate IDs on cloned Symantec Endpoint Protection 12.1 clients
Article:TECH163349 |
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Created: 2011-06-27 |
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Updated: 2013-05-17 |
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Article URL http://www.symantec.com/docs/TECH163349 |
For the feature image creation with SEP client follow it
How to prepare a Symantec Endpoint Protection 12.1.x client for cloning
Article:HOWTO54706 |
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Created: 2011-06-27 |
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Updated: 2014-02-07 |
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Article URL http://www.symantec.com/docs/HOWTO54706 |
Hope above information help you.