Starting on Version 1708 the ‘Update Now’ from the Office 365 Application backstage is no longer visible if the Office installation is also configured to receive updates through SCCM.
This change was implemented so that Users cannot bypass administrative configuration settings around updating Office.
Prior to Version 1708:
At Version 1708 and greater you will see a message that Updates are managed by your admin:
The ‘Update Now’ option is also hidden:
If a user requires individually updating the Office Client outside of SCCM, they can still do this through command line with elevated privileges.
To manually trigger an Office update, run “OfficeC2RClient.exe /update user” from the cmd prompt path ‘C:\Program Files\Common Files\Microsoft Shared\ClickToRun>”
To specify a specific version run “OfficeC2RClient.exe /update user updatetoversion=16.0.xxxx.xxxx”
For more information around configuring updates, please see Configure Update Settings for Office 365 ProPlus.