Someone on another forum gave me the solution:
do you use AV? because it sure sounds like your AV hasn't updated the registry
https://support.microsoft.com/en-us/help/4088876
that's the latest CU, but it's been that way since Jan (Meltdown / Spectre vulnerabilities)
I added the regkey on the problem clients and after a reboot I got the updates of January, February and March.
We have a strange problem at the moment.
It's a SCCM 2012 R2 Sp1 environment and on this environment we host our Windows 8.1 clients. Last week I discovered that several clients which are fresh installed by SCCM doesn't get any Windows 8.1 updates anymore after 31-12-2017.
Microsoft Office 2013 is no problem, The client is receiving updates until April 2018.
A clients which is installed a long time ago (I think here is also 31-12-2017 the date) has no problem and receives the Windows 8.1 updates until April 2018.
I don't see any errors is the SCCM loggings like updatesstore.log, updateshandler.log and updatesdeployment log.
When I look in the reports and take for example update Win 8.1 kb4088879 x64 it is not required for all the new installed clients.
When I download the patch from internet I can install it without any problem.
Another strange thing is that when I go to the client and check online for updates I only see update till 31-12-2017.
I also checked the KMS server and I don't see any problems when the client is registered at the KMS server.
So any help would be appreciated.
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