Hi,
Thanks for posting in Microsoft MECM Q&A forum.
1,Maybe, there is some registry entries pointing Office to the SCCM server for update.
If you are using the click to run version, please check below registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\ClickToRun\Configuration and set OfficeMgmtCOM to False
2,You can also try to set a GPO for Office Updates. Refer to:
Thanks for your time. Have a nice day!
Best regards,
Simon
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