Can you give the exact names of all repositories in the content view?
It kinda looks like from your request that you have marked that clients as using an ‘8.3’ release version. That means that many of the RHEL 8 repos won’t work as is. You have to explicitly enable and sync the 8.3 repos, which we don’t typically recommend. So if you’ve set the release version on the content host to ‘8.3’ ,try setting it to just ‘8’.