В момент добавления пользователя в группу возникает ошибка:
In order to upgrade the database, you must run SSSD.
Removing cache files in /var/lib/sss/db should fix the issue, but note that removing cache files will also remove all of your cached credentials.
Could not open available domains
usermod: sss_cache exited with status 70
usermod: Failed to flush the sssd cache.
Смотрим содержимое каталога:
ls /var/lib/sss/db
cache_implicit_files.ldb config.ldb sssd.ldb timestamps_implicit_files.ldb
Удаляем кэш:
rm /var/lib/sss/db/cache_implicit_files.ldb
Пробуем снова. Done!