On a fresh install of the Aggregator and Collector servers, we installed the application to a different path than the default, the systemd init scripts do not use the chosen path.
So instead of /opt/CA/<install folder> I installed to /opt/CA/Perfmgmt/<install folder>
These files have the wrong path to the startup scripts for dadaemon.service, dcmd.service and activemq.service in the /etc/systemd/system directory. They use the default path option presented at install time which was not used
There were remnants of a previous installation, with the default install path
Release : 20.2
Component : IM Reporting / Admin / Configuration
Solution is to update the files with the proper paths and restart systemd or reboot server (I rebooted) The dadaemon, dcmd and activemq services now start properly.