User reported that some user account is missing primary and some secondary UNIX groups in RHEL 7

Issue

# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.3 (Maipo)

# systemctl status sssd
● sssd.service - System Security Services Daemon
   Loaded: loaded (/usr/lib/systemd/system/sssd.service; enabled; vendor preset: disabled)
  Drop-In: /etc/systemd/system/sssd.service.d
           └─journal.conf
   Active: active (running) since Thu 2017-07-27 16:25:51 AEST; 22min ago
  Process: 7314 ExecStart=/usr/sbin/sssd -D -f (code=exited, status=0/SUCCESS)
 Main PID: 7315 (sssd)
   CGroup: /system.slice/sssd.service
           ├─7315 /usr/sbin/sssd -D -f
           ├─7316 /usr/libexec/sssd/sssd_be --domain default --uid 0 --gid 0 --debug-to-files
           ├─7317 /usr/libexec/sssd/sssd_nss --uid 0 --gid 0 --debug-to-files
           ├─7318 /usr/libexec/sssd/sssd_pam --uid 0 --gid 0 --debug-to-files
           ├─7319 /usr/libexec/sssd/sssd_autofs --uid 0 --gid 0 --debug-to-files
           └─7320 /usr/libexec/sssd/sssd_sudo --uid 0 --gid 0 --debug-to-files

sssd[nss][7317]: More groups have the same GID [1336] in directory server. SSSD will not work correctly.

sssd[nss][7317]: More groups have the same GID [1336] in directory server. SSSD will not work correctly.