Green Dot not appearing on SEP Client Shield

Hi guys i just want to confirm that if the client machines OS is deployed via a cloned image (SEP agent is not installed on the base image)  if the same base image is installed on like 30 machiens and later we install SEP agent on each machine would it cause any problem ?

At the moment green dot is not appearing on the SEP shield , though on client I can see that it is connected to the SEP server and on SEPM console in clients tab I see that client is showing connected and last time status change is also recent.

What could cause the greendot not to dispay on the shield keeping in mind that in Help > Troublehsooting it is showing as connected to the SEPM server.

Thanks