AD schema is not extended or SLP is not present. Cannot continue site assignment

You may received the error - "AD schema is not extended or SLP is not present. Cannot continue site assignment." log in LocationServices.log when the SCCM client is successfully installed on the machine, but the SCCM client failed to discover primary site.

If the above entry is log, there are few things you may need to look into before you proceed with further action:

1. Is the Management Point publish in Active Directory?
   
2. Is the Management Point publish in DNS?
3. If you are using WINS for name resolution, you may need SLP registered in WINS.

How if the above components are already in-place but the SCCM client is still failed to discover primary site?

Another simple trick, try to verify your network DNS & WINS settings, the SCCM client may failed to assign to primary site due to incorrect assignment of DNS & WINS address.