Huawei Mate 9 - Manual (Page 185)

Configured
Exchange accounts
4
Touch When reply to event is. You can:
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When Yes, Maybe, or Not replied is selected, do not disturb mode is enabled for meetings
if you responded Yes or Maybe to the Exchange meeting invitation, or if you did not
respond. Do not disturb mode is not enabled if you declined the invitation.
System Features and Settings
179