Trouble with freeradius and ldap groups

[D C]

​Hi,
I'm currently configuring freeradius with an openldap backend for network
device authentication. For each vender I have to add a set of attributes to
my ldap user, then I can log in with the desired access.

So far this is working as expecting (mostly, but i'll save that for a
different thread).  I don't want to have to added each of the specific
attributes into each ldap user who needs admin access.  Instead I want to
make the admin users members of an ldap group which contains the needed
attributes.
I cannot get freeradius to use the ldap groups (and don't ever see it send
ldap queries for groups).

in my modules/ldap file I have:
        groupname_attribute = cn
        groupmembership_filter = "(member=%{control:Ldap-UserDn})"
        groupmembership_attribute = radiusGroupName


Does anyone have an example of how this is supposed to be configured?​