User Configuration > Administrative Templates > Microsoft Office 2016 > Security Settings > Digital Signatures
User
HKCU\software\policies\microsoft\office\16.0\common\signatures
This policy setting lets you determine whether Office 2016 requires OCSP (Online Certificate Status Protocol) revocation data for all digital certificates in a chain when digital signatures are generated. If you enable this policy setting, Office 2016 requires OCSP revocation data for all certificates in a chain when digital signatures are generated. If you disable or do not configure this policy setting, Office 2016 does not set any restrictions on what type of revocation data is to be used.