Setting use_fully_qualified_names in sssd.conf returns [Invalid SSSD configuration detected]

Issue

Setting use_fully_qualified_names = False in sssd.conf returns [Invalid SSSD configuration detected]

• use_fully_qualified_names = False option has just been added to sssd.conf

  [domain/idm.example.com]
  
  id_provider = ipa
  ipa_server_mode = True
  ipa_server = server.idm.example.com
  ipa_domain = idm.example.com
  ipa_hostname = server.idm.example.com
  auth_provider = ipa
  chpass_provider = ipa
  access_provider = ipa
  cache_credentials = True
  ldap_tls_cacert = /etc/ipa/ca.crt
  krb5_store_password_if_offline = True
  use_fully_qualified_names = False     <<<<<=====
  
  [sssd]
  services = nss, pam, ifp, ssh, sudo
  default_domain_suffix = example.com
  domain_resolution_order = example.com, idm.example.com
  domains = idm.example.com
  

• Below SSSD log is recorded in /var/log/messages:

  systemd[1]: Starting System Security Services Daemon...
  sssd[21981]: Error (1432158262 [Invalid SSSD configuration detected]) retrieving domain [idm.example.com], skipping!
  sssd[21981]: Starting up
  sssd[21981]: Error (1432158262 [Invalid SSSD configuration detected]) retrieving domain [idm.example.com], skipping!
  sssd_be[21982]: Starting up
  sssd_be[21982]: Error (1432158262 [Invalid SSSD configuration detected]) retrieving domain [idm.example.com], skipping!
  sssd_nss[21983]: Starting up
  sssd_nss[21983]: Error (1432158262 [Invalid SSSD configuration detected]) retrieving domain [idm.example.com], skipping!
  sssd_ifp[21985]: Starting up
  sssd_ifp[21985]: Error (1432158262 [Invalid SSSD configuration detected]) retrieving domain [idm.example.com], skipping!
  sssd_sudo[21987]: Starting up
  sssd_sudo[21987]: Error (1432158262 [Invalid SSSD configuration detected]) retrieving domain [idm.example.com], skipping!
  sssd_ssh[21986]: Starting up
  sssd_ssh[21986]: Error (1432158262 [Invalid SSSD configuration detected]) retrieving domain [idm.example.com], skipping!
  sssd_pac[21988]: Starting up
  sssd_pac[21988]: Error (1432158262 [Invalid SSSD configuration detected]) retrieving domain [idm.example.com], skipping!
  sssd_pam[21984]: Starting up
  sssd_pam[21984]: Error (1432158262 [Invalid SSSD configuration detected]) retrieving domain [idm.example.com], skipping!
  

• AD trust between IdM and AD domain has been established.

• default_domain_suffix and domain_resolution_order options are present in sssd.conf to allow AD user authentication without specifying domain portion of username:

  default_domain_suffix = example.com
  domain_resolution_order = example.com, idm.example.com