Unable to see computers in WSUS computer group

Hi all,

I've got an upstream WSUS server on 2012 R2. I've configured it as required; the GPO points the clients to the WSUS server, but for some reason, I cannot see the machines on the Computer Group I created and targeted on the GPO, although the policy applies to all computers that the GPO is linked to.

Any thoughts, please? 

Thanks in advance.

Log into one of the computers in that group and do an nslookup for the WSUS server. First step is to confirm those clients can communicate with WSUS.

I got the issue sorted out, sir.

Thank you so much, though