In order to get the new Activity Recorder events from macOS clients, they need to have the 14.3 client. If you deploy the macOS SES client to a Mac running 10.14 or earlier, you only get the latest 14.2 client.
In order to get the Activity Recorder events, you must be running macOS 10.15 (Catalina).
All other versions of macOS will get 14.2 or earlier, per System requirements for Symantec Endpoint Security.