Outlook automatically decline meetings

Hello there, 

I tried to use the process on Outlook to automatically decline meetings on a calendar (File -> Options -> Calendar ->Auto Accept/Decline..) but it simply does not work for me.

NB : The account is not for someone to be connected with on a Outlook Client, , only the calendar is used to publicly show teams meetings. 

How can i restrict from Exchange (The Server instead of the Outlook Client) a rule to automatically decline meetings proposition and made it so that it will not show on the account calendar.