Satellite 6.6 on-demand packages failing to download

hi all,

satellite 6.6.3
test server rhel 8.1

I am testing RH Satellite 6.6 and configured 3x repositories:
rhel 8 baseos
rhel 8 appstream
satellite 6.6. tools

I am trying to install a katello-agent on a rhel8.1 test server to be managed by satellite; but I am getting 404 code. (in fact any package I try I get the same error message

My Satellite 'Default Repository download policy is set to "on-demand"' therefore it will pull file from rh cdn 'upon request'

On my Satellite server, therefore, I can not see the dir /var/lib/pulp/content/units/rpm being created ....

I would like to understand how to tshoot this issue, which seems to be between my Satellite server and rh cdn.

Comments, suggestions appreciated.