Solutions for “This system is not registered” on Red Hat/ Centos 8
Step 1: in the plugin configuration file disable plugin.
Change the enabled from “=1” » to “=0”
# vim /etc/yum/pluginconf.d/subscription-manager.conf
enabled=0
Step 2: disable the subscription manager repository by below command
# subscription-manager config –rhsm.auto_enable_yum_plugins=0