Can't get legacy clients reporting to 14.x SEPM

I am testing a new SEPM 14.x deployment,  we have a number of legacy clients to manage but I am unable to get 2003 Server or XP reporting to SEPM

I have push installed a client version 12.1.5 RU5 client to a 2003 Sp2 server, and while the client seems to be functional and according to the client log seems to be receiving policy from the SEPM, however the client does not show up in the SEPM console at all

How can I troubleshoot this?

thanks