[Samba] rid backed not working

[Leszek Gubernat]

Hi All,
I'd like start using 'rid' idmap backed rather than 'tdb' on my member 
servers to keep gidNumbers in sync across the realm INCLUDING the DC. 
Problem is when I execute
member1# getent group "MPD1\group1"
I get no output. The gidNumbers fall within the range of 30000-60000.
pestparm passes nicely. No erros logged whilst executing getent.
Could anyone point me in the right direction? Thank you.


ADDC:
Gentoo hardened; kernel 4.9
Samba 4.5.15 (installed from the distribution)

addc /etc/samba/smb.conf
# Global parameters
[global]
         server role check:inhibit=yes
         dsdb:schema update allowed = yes
         netbios name = ACDC
         realm = SOME.REA.LM
         workgroup = DOMAIN
         server role = active directory domain controller
         idmap_ldb:use rfc2307 = yes
         ldap server require strong auth = no
         unix extensions = no
         security = user
         dns forwarder = 1.2.3.4
         allow dns updates = nonsecure
         log level = 1
         log file = /var/log/samba/log.%m
     ntp signd socket directory = /var/lib/samba/ntp_signd
     time server = yes




member1:
Gentoo hardened 2018; kernel 4.17
Samba 4.11.0 compiled:
./configure --prefix=/usr/local/samba --disable-cups --disable-iprint 
--without-ad-dc



memeber1 /etc/samba/smb.conf
[global]
         netbios name = member1
         realm = SOME.REA.LM
         workgroup = DOMAIN
         security = ADS
         log level = 2
         max log size = 50000
         log file = /var/log/samba/log.%m
         idmap config * : backend = tdb
         idmap config * : range = 20000-25000
         idmap config MPD1 : backend = rid
         idmap config MPD1 : range = 30000-60000




member1 /etc/nsswitch.conf
passwd:      compat files winbind
shadow:      compat files
group:       compat files winbind

hosts:       files dns
networks:    files dns

services:    db files
protocols:   db files
rpc:         db files
ethers:      db files
netmasks:    files
netgroup:    files
bootparams:  files

automount:   files
aliases:     files


lrwxrwxrwx 1 root root 26 Oct 10 14:33 /lib64/libnss_winbind.so -> 
/lib64/libnss_winbind.so.2
lrwxrwxrwx 1 root root 40 Oct 10 14:32 /lib64/libnss_winbind.so.2 -> 
/usr/local/samba/lib/libnss_winbind.so.2