Hello Stephan,
Thank you for your question and for reaching out with your question today.
The version discrepancy you're observing in Windows Defender platform versions on your computers may be due to different release channels and update paths.
Microsoft releases Windows updates and patches through various channels, including the Microsoft Update Catalog, Windows Server Update Services (WSUS), and Windows Update. Sometimes, there can be a delay between when an update is released by Microsoft and when it becomes available through WSUS.
In your case, it's possible that the version 4.18.23050.5 of the Windows Defender platform was released by Microsoft but hasn't been synchronized to your WSUS server yet. This can explain why some computers have received the update directly from Microsoft while others are still awaiting it through WSUS.
Regarding the discrepancy in the number of computers that received the update, there could be several reasons. It's possible that some computers haven't connected to the WSUS server recently, or there may be configuration issues preventing them from retrieving updates properly. Additionally, certain computers may have different update settings or be in a different update group within your WSUS infrastructure.
To investigate further and ensure all your computers receive the update from WSUS, you can check the WSUS server synchronization status, review the update deployment settings, and verify the client connectivity to the WSUS server. Additionally, you may need to troubleshoot any potential issues with the WSUS infrastructure or the affected client computers.
I used AI provided by ChatGPT to formulate part of this response. I have verified that the information is accurate before sharing it with you.
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Best regards.