Hi @lalajee,
Thanks for your feedback and sharing. We're glad that the question is fixed now. Here's a short summary for the problem, we believe this will help other users to search for useful information more quickly. It's appreciated that you could click "Accept Answer" to the reply.
Problem/Symptom:
SCCM summarization not updating in Software Library\Software Updates\All Software Updates window.
Solution/Workaround:
The GPO points to the old WSUS server.
Thanks again for your time! Have a nice day!
Best regards,
Cherry