The problem has been detected while trying to deploy an AlmaLinux 8.6 machine. The auth command should be replaced by authselect. Sources: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/performing_an_advanced_rhel_8_installation/kickstart-commands-and-options-reference_installing-rhel-as-an-experienced-user#deprecated-kickstart-comands-and-options_kickstart-changes