Update the registry to remove the Office 365 activation prompt
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Close the activation window and all Office apps.
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Right-click the Start button
on the lower-left corner of your screen, and select Run. -
Type regedit, and then press Enter. Select Yes when prompted to open the Registry Editor.
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On the left side of the Registry Editor, under Computer, navigate to the following key in the registry:HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Office\16.0\Common\OEM
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Right click the OEM value and click File>Export.
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Save the key.
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After the key is backed up, select Edit>Delete.
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Repeat steps 3-6 for the following key:HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\16.0\Common\OEM
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Close the Registry Editor and start Office again.
