Same story there: discovered how great are the new central management agent features, but excitement ended soon because of the agent licensing issue (that, compared to socket/VM licensing and maintenance, are not a big deal
So I removed the protection group and any reference on B&R server, uninstalled the agent and another component from the client, rebooted all and still not working. Unfortunately I used the OU discovery to populate the protecion group and had to uninstall and reinstall many clients because I haven't found how to "release them" from central management.
Found that there was both the flag in the client/agent settings, and also found the job disabled on B&R srv. Enabling both of them seem doing the job.
Thanks for your sharing