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Document URL: 

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html-single/performing_a_standard_rhel_9_installation/index#changing-a-subscripton-service_installing-RHEL

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html/performing_an_advanced_rhel_9_installation/assembly_registering-and-installing-rhel-from-satellite-via-kickstart_installing-rhel-as-an-experienced-user#doc-wrapper

Describe the issue: 

In RHEL9 documentation is reported to register the host to Satellite 6, but is not specified that there's a minimum release needed for Sat6 to be capable of managing RHEL9 hosts.

Suggestions for improvement: 

Please clearly specify that in order to register a RHEL9 to Sat6, is MANDATORY to have at least Sat 6.11. 

Additional information: 
There's a big hype on the new release of RHEL, so a lot of customers are trying to use RHEL9 and they will be frustrated and disappointed because their current infrastructure does not work. And this will hurt RHEL9 perception.
Unfortunately nothing prevent - on Sat6 side - to sync into Sat6 RHEL9 content if you are on Sat6 < 6.11. 
But RHEL9 *is not supported* on any Satellite < 6.11 so it's important to clarify in the prerequisites, early in RHEL9 doc, that if you want to associate your RHEL to Sat6, Sat6.11 is needed.

Thanks for confirmation +aperotti,

I have pusblished the changes in the docs on the customer portal. Here are the links to the updated docs for reference. 

Advanced installation guide:
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html-single/performing_an_advanced_rhel_9_installation/index#proc_registering-and-installing-rhel-from-satellite_assembly_registering-and-installing-rhel-from-satellite-via-kickstart

Standard installation guide:
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html-single/performing_a_standard_rhel_9_installation/index#configuring-connect-to-redhat_connect-to-red-hat (3.1.3.5.2. Configuring Connect to Red Hat options)
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html-single/performing_a_standard_rhel_9_installation/index#register-and-install-from-cdn-using-gui_register-and-install-from-cdn (Registering and installing RHEL from the CDN)

No more updates are pending on this issue hence closing it. In case any more updates are required, feel free to reopen this issue or create a new one. 

Regards,
Sagar Dubewar