Hi FranC365-7229,
It is a good idea to hear that the needed updates are added into the CM console. I'm not sure why the windows 10 boxes are unchecked. Perhaps some one in your team have changed the settings. Any way, it is OK and this issue has been resolved successfully.
For the how to get the history of previous updates question, it is recommended to refer to the below picture to configure:
Set the Supersedence Rules:
In my opinion, the WSUS Maintenance option is used to clean up the WSUS database automatically.
In my opinion, we could not get the previous updates back if these updates are cleaned. But we could deploy the latest updates for the clients. The security updates are cumulative in windows 10 and contain the previous updates. So there is no need to deploy the previous updates for the clients.
In addition, there is a link for your reference:
https://learn.microsoft.com/en-us/troubleshoot/mem/configmgr/wsus-maintenance-guide
Hope the above will be helpful. Thanks for your time.
Regards,
Rita
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