Can you check in the following registry.
HKEY_LOCAL_MACHINE\software\policies\microsoft\office\15.0\common\OfficeUpdate
DWORD: HideEnableDisableUpdates
Values:
1 = hide the menu option to enable or disable automatic updates
0 = show the menu option to enable or disable automatic updates
DWORD: EnableAutomaticUpdates
Values:
0 = automatic updates are disabled
1 = automatic updates are enabled
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