Hi,
Can you check https://vcenter_server_ip/mob/ and browse to the ExtensionManager and see the server property of the com.vmware.vcHms extension?
Also, see the /var/log/boot.msg and /opt/vmware/hms/logs/hms.log files (towards the end) at the VR appliance.
There would be details if VRMS did not update its extension data in vCenter Server after the reboot.
Can you please verify that /opt/vmware/etc/vami/ovfEnv.xml file is non-empty?
Regards,
Martin