Hi Robert Agusto,
Hope everything is going well.
1,Agree with S.Sengupta. We can reset Windows Update and force update detection on the client to have a try.
2,For test purposes, we can remove one or a few affected devices from the WSUS MMC console. On each affected system, run the client-side script in below article once from an elevated (Run as administrator) prompt to have a try. Can the client hit the WSUS site via browser? For more troubleshooting steps, please refer to:
Client Machines Not Reporting to WSUS Properly?
Note: This is non-Microsoft link, just for your reference.
Feel free to contact me if you have any concerns/queries.
Best regards,
Simon
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