WSUS Not Offering Quality Updates After Windows 11 23H2 Upgrade

Hi everyone,


I'm hoping someone here can help. We've recently upgraded several PCs to Windows 11 version 23H2 (x64), using WSUS. The upgrade installs successfully, but after that, none of the client machines are detecting or showing any need for cumulative updates—or any other updates, for that matter.


I've confirmed that the correct MIME types are configured in IIS Manager on the WSUS server.


Has anyone else encountered this, or have suggestions on what to check next?


Thanks in advance!