Hi, even if you subscribe the system to katello, you won’t be able to manage packages from it. There’s a problem with katello ddbb and seems fixing it is not really a priority for now. (I’m also waiting for it, btw ) .
There’s a workaround via a PR, but you need to rebuild whole foreman+katello from scratch and it’s strongly discouraged/not ready for production environments.
check also : 'Content hosts' not showing installable updates for Debian like systems
Sorry for the bad news.
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