After Windows images with Symantec Management Agent deploy, they cannot register with the task server and don't receive the task for the next steps.
In this particular case, Notification Server's DNS name was different from the FQDN.
Also, based on the logs the Agent was using http instead of https to register with the NS and task server.
In the Console go to Targeted Agent Settings> Agent/ Plug-ins> Targeted Agent Settings>Initial Settings> Advanced tab, changed the server URL to HTTPS.
Also, In NS console> Settings> Agent/Plug-ins> Symantec Management Agent> Symantec management agent communication profile> NS Communication profile, make sure the resolvable name comes first.