NIS client doesn't see group names

NIS client doesn't see group names

I have added a user to libvirt (id = 504) group on NIS server. On the
client when I do group <user>, I get <user> groups: cannot find name for
group ID 504 What should I do to get my clients to display group names
correctly ?
There are no id conflicts between local machine and NIS server nscd is not
running. My /etc/nsswitch.conf looks like this:
passwd: compat nis
shadow: compat nis
group: compat nis
Appreciate any help in debugging this.