Only 3 endpoint clients on SEPM

Hi,

running SEPM 12.1.3. When I deploy 7 SEP clients, on the Clients section only show up 3 clients. SEPM is installed following the manual and there is no firewall between the clients and the SEPM. Tried turning off all Windows firewalls, but still the same. Is it a license issue? I am using trial by now.

The 'secars' check displays OK in every SEP client browser. All clients are on Windows Server 2008 R2, the same as the SEPM.

Any help?