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  • Pre-requisites:
    • You should enable Server Side Synchronization for user whose Outlook Add-in is required to be enabled.
    • Enable Outlook Add-in and assign Dynamics 365 for Outlook Add-in security role to user.
    • Follow below steps only if above 2 settings do not work.
  • Steps to be followed:
    1.  Open PowerShell command prompt as an Administrator.
    2.  Execute below commands.
      Set-ExecutionPolicy RemoteSigned
      Install-Module -Name ExchangeOnlineManagement
    3.  After executing above command, execute below command. It will ask you to login as an administrator in the tenant of user. Please note: Replace Alias with email id of user for whom you are trying to add the add-in.
      Connect-ExchangeOnline
      Set-CASMailbox <Alias> -EWSEnabled $True
    4.  Once above command is executed successfully, try installing the add-in after an hour.
Keywords: Outlook, Outlook Add-in, Dynamics 365 Outlook