Policy
Disable Office First Run on application boot
This policy setting determines whether the Office First Run comes up on first application boot if not previously viewed. If you enable this policy setting, the Office First Run does not run on first application boot. If you disable or do not configure this policy setting, the Office First Run about signing-in to Office comes up on first application boot if not previously viewed.
e1f6edf4494e L_DisableOfficeFirstrun Registry
Copy registry mappings
HKCU\software\policies\microsoft\office\16.0\firstrun\bootedrtm (enabled) = 1
HKCU\software\policies\microsoft\office\16.0\firstrun\bootedrtm (disabled) = 0 Policy notes
This policy setting determines whether the Office First Run comes up on first application boot if not previously viewed. If you enable this policy setting, the Office First Run does not run on first application boot. If you disable or do not configure this policy setting, the Office First Run about signing-in to Office comes up on first application boot if not previously viewed.