Hello,
Since the clients are not reporting to the SEPM, that could be the reason the Policies on the clients are not being changed.
It is important to have the clients reporting to the SEPM.
What version of SEPM and SEP clients are you running?
You would require the SylinkReplacer Utility to have them replace with sylink.xml file which would in turn get the client reporting to the SEPM.
In case of SEP 11.x, use the SylinkReplacer Utility found below -
https://www-secure.symantec.com/connect/downloads/sylinkreplacer-tool-connecting-sep-clients-sepm
In case of SEP 12.1, you can use the SylinkReplacer version_12.1 for getting all the clients back.
To get that tool you will have to call symantec or log a web case.
How to create a new case in MySupport
http://www.symantec.com/docs/TECH58873
OR
Regional Support Telephone Numbers:
- United States: https://support.broadcom.com (407-357-7600 from outside the United States)
- Australia: 1300 365510 (+61 2 8220 7111 from outside Australia)
- United Kingdom: +44 (0) 870 606 6000
Additional contact numbers: http://www.symantec.com/business/support/contact_techsupp_static.jsp
Also, check these Articles below:
How to change the sylink.xml file in Symantec Endpoint Protection (SEP) 12.1
http://www.symantec.com/docs/TECH157585
Restoring communication to Symantec Endpoint Protection clients with a new Sylink.xml file
http://www.symantec.com/docs/TECH106288
Hope that helps!!