Hi @wen yao
After you install the Windows Server Update Services (WSUS) server role on your server, you need to properly configure it. You also need to configure your client computers to receive their updates from the WSUS server.
Here is a thread as well which discusses the same issue and you can try out some troubleshooting steps from this and see if that helps you to sort the Issue.
Why are not there windows server 2022 patches in WSUS?
Hope this resolves your Query!!
--If the reply is helpful, please Upvote and Accept it as an answer--
I'm sorry for bothering you. I noticed that you haven't posted a new case in the Chinese Supported forum. I'm afraid that I will missed something and the issue will not be resolved successful. Finally, I come here and want to know the progress of this case. If there is any offense, please be kind to understand. Thanks for your understanding and cooperation in advance.
May I know the status of the case? Is there any updates? Have you installed any Language Package in the WSUS server? Please keep us in touch if there are any updates or questions.
Have a great day and Happy New Year in advance :)