Hi Justinller,
1. On the "upgraded" Server 2012R2, please check if they can detect the updates from Microsoft Update;
2. Please check if the following method could help:
1) On the WSUS server, delete the two problematic clients;
2) On the "upgraded" machines, reset the SUSClientID:
In cmd, net stop wuauserv
Delete the value in registry key " SusClientId " and "SusClientIDValidation" locates in:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate
In cmd, enter net start wuauserv, then, enter wuauclt.exe /resetauthorization /detectnow and restart the machines.
3. After reset SUSClientID, check if they can show up in the WSUS server again and report correctly.
Best Regards,
Anne
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